A conversion kit can turn a dependable bicycle into an electric ride, but the wrong motor can make the bike awkward, overpowered, or impossible to fit. The key choice is not simply how much power appears on the box. It is where that power goes, how the bike senses your pedaling, and whether the wheel, bottom bracket, battery, and brakes actually match.
The Best ebike conversion kit for most riders is the LIVALL PikaBoost 2 220Wh, because it adds assistance without asking you to rebuild the drivetrain or replace a wheel. The rest of this list covers everything from compact commuter hardware to powerful mid-drive and rear-hub systems for riders who need more torque.
Comparison table
| # | Product | Award | Motor or battery | Fit | Best for |
|---|---|---|---|---|---|
| 1 | LIVALL PikaBoost 2 220Wh | Best overall | 220Wh battery | Round seatposts, 25 to 35mm | Simple pedal assist |
| 2 | BAFANG BBS02B Mid Drive | Best flexible mid-drive | 500W, 750W, or 1000W | 68 to 73mm, 100mm, or 120mm BB | Custom builds |
| 3 | Varstrom TSDZ-2B Torque Sensor | Best natural pedaling | 500W, 750W, or 1000W | 68 to 73mm BB | Hill climbing with pedal feel |
| 4 | BAFANG BBS-HD 1000W | Best high-torque mid-drive | 160Nm torque | 68 to 73mm, 100mm, or 120mm BB | Steep terrain and heavy loads |
| 5 | BAFANG 48V Rear Hub | Best rear-hub system | 500W or 750W | 135 to 142mm rear dropout | Commuters and mixed brakes |
| 6 | Varstrom Dual Hub Kit | Best hub-motor range | 1000W or 1500W | Front, 101 to 109mm, or rear | Multiple wheel configurations |
| 7 | Ktaxon 48V Front Hub 26-inch | Best 26-inch front hub | 48V, 1000W | 26-inch, 3.93-inch dropout | Straightforward front conversion |
| 8 | LIVALL PikaBoost 2 Lite | Best compact commuter | 158Wh battery | Round seatposts, 25 to 35mm | Short urban trips |
| 9 | GOSHET 72V Rear Hub | Best high-voltage hub | 72V, 2000W | 27.5-inch rear wheel | High-output custom builds |
| 10 | Ktaxon 48V Front Hub 24-inch | Best 24-inch conversion | 48V, 1000W | 24-inch, 3 15/16-inch dropout | Smaller-wheel bicycles |
1. LIVALL PikaBoost 2 220Wh: Best Overall
Pros
- Installs at the rear wheel without extra wires
- 220Wh battery offers up to 43 miles under ideal conditions
- Three assist modes and app-based calibration
- Tilt detection and SOS alert add a useful safety layer
Cons
- Only fits round seatposts from 25 to 35mm
- Requires a 65W USB-C charger, which is not included
- Not intended for children's bicycles
Best for: riders who want electric assistance without replacing a wheel or modifying the crankset.
The LIVALL PikaBoost 2 220Wh is the least disruptive conversion here. It attaches around the rear wheel and assists the bike without the usual wheel swap, bottom-bracket removal, chainring change, or bundle of motor cables. That makes it the one we'd point toward when the existing bicycle already fits well and the rider wants help on hills rather than a completely different machine.
Its 220Wh battery is the larger PikaBoost option, with a claimed range of up to 70km, or 43 miles, under ideal conditions. Real range will depend on rider weight, terrain, assist use, and weather, but the capacity gives this version more breathing room than the 158Wh PikaBoost 2 Lite below. The unit weighs 6.6 pounds and measures 13.3 by 5.2 by 3.3 inches, so it is compact enough to keep the original bike's character while still being substantial hardware.
Setup is handled through the mobile app, which supports automatic calibration and three modes: Assist, Cruise, and Workout. The ability to switch between assisted riding and regular cycling without removing the unit is more useful than it sounds. A gyroscope can stop assistance when the system detects a tilt above 30 degrees, while a tilt above 60 degrees triggers an SOS alert. Those features do not replace sensible riding, but they give the PikaBoost a more considered safety system than the basic hub kits.
The important catch is fit. The PikaBoost works only with round seatposts measuring 25 to 35mm, and the seatpost size needs to be checked before ordering. It is also an assist accessory, not a complete electric bike, and the required 65W USB-C charger is not supplied. Riders who need strong cargo-hauling torque or who have an unusual seatpost should choose the BAFANG BBS02B Mid Drive instead. For a compatible commuter bike, though, this is the cleanest conversion in the group.
If you are still deciding whether a converted bike or a factory-built model better suits your route, the differences between a bicycle conversion and a complete electric ride can clarify the trade-off. The PikaBoost is right for someone who values reversibility, light integration, and a normal pedal-bike feel.
2. BAFANG BBS02B Mid Drive: Best Flexible Mid-Drive
Pros
- Several motor output choices in one mid-drive family
- Up to 160Nm of claimed torque
- Works with multiple bottom-bracket widths
- Supports throttle, pedal assist, and standard cycling
Cons
- Battery and display may be optional
- Requires a chain-driven bike with disc or V-brakes
- Bottom-bracket compatibility must be measured carefully
Best for: experienced DIY riders building a tailored commuter, mountain bike, or recumbent trike.
The BAFANG BBS02B Mid Drive is the adaptable workhorse of this roundup. Unlike a front or rear hub motor, it drives through the bicycle's chain and gears, so the rider can use the existing drivetrain to keep the motor in a useful cadence range. That makes a mid-drive particularly appealing on changing terrain, where a direct wheel motor can feel less flexible.
This listing covers 500W, 750W, and 1000W configurations, with claimed torque figures of 100Nm, 120Nm, and 160Nm respectively. Those are substantial differences, so choosing the motor option matters as much as choosing the kit itself. The 500W version is the more measured fit for ordinary riding, while the larger versions are aimed at riders who regularly face steep climbs or want a more forceful build. The system can reach up to 45km/h according to the product details.
Compatibility is broad but not universal. The kit supports bottom brackets measuring 68 to 73mm, 100mm, or 120mm, with a 33.5 to 36mm inner diameter under JIS standards. The donor bike must be chain-driven and use either disc or V-brakes. The kit includes items such as brake levers, a chainwheel, thumb throttle, speed sensor, headlight, and a bottom-bracket removal tool, while the battery and LCD display can be selected separately. The male XT60 connector also means the battery connection needs to be checked before installation.
The configurable CAN display choices are a strong point for a custom build. The listed options include several BAFANG displays plus VD03, EKD01, VD04, VD618, and VD18MT models, with BAFANG displays able to modify motor parameters through the display or BAFANG GO app. That is more control than the simpler Ktaxon hub systems provide, but it also creates more decisions and more opportunities for a mismatch.
The weakness is the installation burden. Removing the bottom bracket, routing cables, setting the sensor, and choosing a compatible battery is a real project, not a wheel-and-tire afternoon. The BAFANG BBS-HD 1000W supplies more defined heavy-duty torque, while the Varstrom TSDZ-2B Torque Sensor feels more natural under pedal pressure. Choose this BBS02B when flexibility and a broad fit range matter more than the quickest installation.
3. Varstrom TSDZ-2B Torque Sensor: Best Natural Pedaling
Pros
- Torque sensor responds to how hard the rider pedals
- Three motor output options
- Four riding modes, including walk assist
- IP65 weather protection
- Designed for a 68 to 73mm bottom bracket
Cons
- Battery choice is separate
- Higher-output versions can be excessive for casual riders
- Claimed range varies by battery capacity and use
Best for: riders who want assistance that rises and falls naturally with their own effort.
The defining feature of the Varstrom TSDZ-2B Torque Sensor is the way it reads pedal force rather than merely waiting for the cranks to turn. A cadence sensor generally gives assistance after movement is detected. A torque sensor can make the motor feel more connected because harder pedaling calls for more help and lighter pedaling calls for less. That is the behavior many experienced cyclists prefer on mixed routes.
There are three configurations. The 48V 500W version is listed with 80Nm of peak torque and a maximum speed of 40km/h. The 750W version raises the claimed torque to 140Nm and the speed to 50km/h, while the 1000W option reaches 160Nm and 60km/h. Those figures describe a wide range of builds, from a daily city bike to a high-output off-road project. The motor is designed for a 68 to 73mm bottom bracket, which is a narrower fit range than the BAFANG BBS02B.
Four riding modes let the rider choose between E-bike, pedal assist, walk assist, and traditional cycling. The LCD display tracks speed, mileage, battery life, and time. An optional EKD01 Bluetooth display adds navigation and ride analytics, according to the listing. The kit is also described as IP65 waterproof and rated for conditions from minus 20 to 45 degrees Celsius. Those environmental claims do not mean every connector can be ignored, but they make the system more suited to regular outdoor use than a bare-bones conversion.
Battery selection remains part of the build. The system supports downtube or rear-rack batteries, and the listed options include anti-theft locks, safety systems, and charge indicators. The product claims up to 55 miles depending on battery capacity, so that figure should be treated as a configuration-dependent ceiling rather than a fixed expectation.
Installation is described as plug and play, with pre-installed cables and guides, but a mid-drive still demands careful fitting around the bottom bracket and chain line. The BAFANG BBS02B Mid Drive is the better pick for broader bottom-bracket compatibility and display customization. Choose the Varstrom when pedal feel is the priority. Riders comparing the behavior of cadence and force sensing can also use how pedal assistance changes the way an electric bike feels as a useful starting point.
4. BAFANG BBS-HD 1000W: Best High-Torque Mid-Drive
Pros
- Claimed 160Nm torque
- Supports 68 to 73mm, 100mm, and 120mm bottom brackets
- Throttle, pedal assist, and standard cycling modes
- Includes crank and bottom-bracket removal tools
- Broad display selection
Cons
- Battery and display may be optional
- Requires a compatible chain-driven bicycle
- High output places more demands on the donor bike
Best for: riders converting a sturdy bicycle for steep grades, off-road use, or heavy loads.
The BAFANG BBS-HD 1000W is the specialist choice for riders who need force at the crank. Its claimed 160Nm of torque is the highest defined figure among the mid-drive options here, and the motor is intended to use the bicycle's gears rather than simply push one wheel. On a steep route, that gearing advantage can matter more than a large headline speed.
Fit covers 68 to 73mm, 100mm, and 120mm bottom brackets with a 33.5 to 36mm inner diameter under JIS standards. The bike must be chain-driven and equipped with disc or V-brakes. The listing describes the kit as suitable for mountain bikes, city cycles, and recumbent trikes, but the donor frame, wheels, brakes, and drivetrain still need to be able to handle the additional output. A powerful motor does not make a lightweight bicycle a heavy-duty bicycle.
The motor is listed with a top speed of up to 45km/h and three modes: throttle, pedal assistance, and standard cycling. Most of the necessary conversion hardware is included, such as brake levers, chainwheel, thumb throttle, speed sensor, headlight, crank removal tool, and bottom-bracket remover. The battery and LCD display are optional, so the finished system depends on what configuration is selected and which compatible battery is prepared.
The display ecosystem is one of the more polished parts of this kit. Options include VD03, EKD01, VD04, VD618, VD18MT, DPC010, and DPC080 models. The listed BAFANG displays can modify motor parameters through the display or BAFANG GO app without requiring a USB programming cable. That is valuable for an owner who expects to tune the ride rather than accept a fixed behavior.
The drawback is that this is not the relaxed route to electrification. Installation takes mechanical skill, and the motor's force can expose weak chains, worn cassettes, poor brakes, or a frame that was never meant for such a conversion. The Varstrom TSDZ-2B Torque Sensor is gentler in feel, while the BAFANG 48V Rear Hub is easier to keep separate from the bicycle's gearing. Pick the BBS-HD when the frame is robust, the route is difficult, and torque is the deciding factor.
5. BAFANG 48V Rear Hub: Best Rear-Hub System
Pros
- Available in 500W and 750W versions
- 65Nm claimed maximum torque
- Fits 135 to 142mm rear dropouts
- Works with disc and V-brake systems
- Includes throttle, pedal assist, walk assist, and regular cycling modes
Cons
- Battery may not be included
- Rear cassette compatibility stops at 10 speeds or fewer
- Display options add configuration decisions
Best for: commuters who want a rear-wheel conversion that leaves the crank and front fork untouched.
The BAFANG 48V Rear Hub takes a sensible middle path. A rear motor provides traction without placing the motor at the steering end, and it avoids the bottom-bracket work required by the BAFANG and Varstrom mid-drives. For a commuter with a compatible rear dropout, that can be a cleaner mechanical change while preserving the bicycle's front-end handling.
The kit comes in 500W and 750W versions, with a claimed maximum torque of 65Nm and speeds up to 40km/h. It uses a brushless geared motor, and the listing gives an IPX5 water-resistance rating plus noise below 55dB. A geared hub can provide useful assistance without requiring the rider to manage motor gearing through the bicycle's chain, although it will not distribute climbing load through the drivetrain the way a mid-drive does.
Fit is centered on rear dropouts from 135 to 142mm and a 10-speed cassette or fewer. It supports both V-brake and disc-brake systems. The kit includes cables and controllers for the rear-wheel swap, while the battery can be selected separately. The supplied male XT60 connector should be matched with the battery before installation. Wheel diameter choices cover 20, 26, 27.5, 700C, 28, and 29 inches, making this one of the more versatile options for existing bicycles.
The four riding modes are throttle, pedal assist, walk assist, and regular pedal cycling. Display choices include VD04, DPC18, SWM58, DZ40, EKD01, and VD18MT models. That gives the buyer room to choose a simple readout or a more advanced control interface, but it also makes it important to verify exactly which display and battery configuration are in the selected kit.
The limitation is not raw capability but rear-wheel compatibility. A bike with a wider axle standard, more than 10 cassette speeds, or an unusual frame may not work without extra changes. The Varstrom Dual Hub Kit offers both front and rear installation paths, while the Ktaxon 48V Front Hub 26-inch is more direct for a compatible 26-inch bike. This BAFANG is the better choice for a conventional commuter that needs rear traction and multiple riding modes.
6. Varstrom Dual Hub Kit: Best Hub-Motor Range
Pros
- Offers front and rear motor configurations
- 1000W and 1500W rear options
- Sine-wave controller for quieter operation
- Supports 26-inch, 27.5-inch, and 700C wheels
- Several display choices
Cons
- Dropout measurements vary by motor and wheel position
- Battery is selected separately
- High-speed claims are not a reason to skip brake and frame checks
Best for: builders who want to choose between front and rear hub placement before finalizing the conversion.
The Varstrom Dual Hub Kit stands out because it is really a family of configurations rather than one fixed wheel solution. The front motor is a 48V 1000W unit with a claimed 66Nm of torque and a maximum speed of 55km/h. The rear choices include a 1000W version with the same claimed torque and a 1500W version rated at 78Nm with speeds up to 70km/h. That spread lets the builder match the motor position and output to the donor bicycle.
The front setup fits 101 to 109mm fork spacing and is offered for 26-inch, 27.5-inch, and 700C wheels. The rear 1000W option fits 132 to 139mm dropouts, while the rear 1500W option fits 138 to 146mm. Both rear versions are designed for disc brakes and can work with up to a 10-speed freewheel according to the listing. These measurements are not interchangeable, so this is a kit where measuring the bicycle first is essential.
A gearless brushless hub motor keeps the design mechanically simple. The sine-wave controller is listed with a 30A maximum for the 1000W version and 35A for the 1500W version, with a claim of stable, quiet operation and minimal maintenance. The kit also supports several displays, including DZ40, SW2-M58, EKD01, DPC18, VD18MT, and a touchscreen option. The battery must be a compatible 48V unit, and the listing advises a BMS above 30A when a battery is not included.
The front installation is simpler than the rear installation in many bicycle designs because it does not involve the cassette or freewheel. It can also put more weight and pulling force at the fork, however, so the fork's construction and dropout security deserve attention. A rear motor can give better traction in some conditions but requires a more exact frame and drivetrain match. The BAFANG 48V Rear Hub is the more restrained single rear-wheel choice, while the GOSHET 72V Rear Hub aims at a far more extreme build.
The main weakness is the amount of configuration ambiguity. The motor wattage, wheel position, wheel size, dropout width, battery, and display all need to line up. A rider who wants a single clearly defined commuter path should choose the Ktaxon 48V Front Hub 26-inch. Choose Varstrom when that range of hardware choices is the point.
7. Ktaxon 48V Front Hub 26-inch: Best 26-Inch Front Hub
Pros
- 1000W brushless, gearless hub motor
- Four riding modes
- LCD shows battery, speed, mileage, mode, and errors
- Power-cutoff brake handle included
- Designed for a common 26-inch bicycle format
Cons
- Battery is not included
- Front dropout spacing is specific
- Claimed load support is limited to 220 pounds
Best for: owners of a 26-inch bicycle who want a conventional front-wheel conversion with a clear display.
The Ktaxon 48V Front Hub 26-inch is a straightforward kit for a common bicycle size. It uses a 48V 1000W brushless, gearless hub motor in the front wheel, so the installation does not disturb the rear cassette or the crankset. That makes the basic mechanical job easier than a mid-drive conversion, provided the donor fork has the required spacing and is suitable for the added motor force.
Its aluminum-alloy rim and high-carbon-steel spokes are described as supporting a load up to 220 pounds. The motor is gearless, which keeps the design simple and avoids internal gear replacement. This type of hub motor does not use the bicycle's gears to multiply torque, so it is less adaptable to steep climbs than the BAFANG BBS-HD 1000W, but it can be a sensible fit for flatter commuting and ordinary recreational routes.
The kit includes a pedal-assist sensor that reads pedal cadence, plus throttle, presets, PAS, and manual riding modes. The LCD display shows battery power, speed, mileage, mode, and error codes. Those error readouts are especially useful during setup because they give the owner more information than a simple row of battery lights. The power-cutoff brake handle is designed to interrupt motor power when the controller receives the brake signal.
Fit is narrower than the name may suggest. This kit is intended for most 26-inch bikes with 3.93-inch front dropout spacing, and the battery is not included. The wheel size may match, but the fork width, brake setup, axle arrangement, battery location, and cable routing still need to be checked. A front motor can also change steering balance, an effect that is less noticeable with a rear hub system.
The kit's weakness is its one-size focus. It does not offer the wheel-size flexibility of the BAFANG 48V Rear Hub, and cadence sensing is less nuanced than the torque sensing in the Varstrom TSDZ-2B Torque Sensor. For a compatible 26-inch donor bike, though, its four modes and information-rich display make it a practical front-wheel starting point.
8. LIVALL PikaBoost 2 Lite: Best Compact Commuter
Pros
- Quick rear-wheel installation
- Built-in 158Wh battery
- Up to 31 miles of assist range under ideal conditions
- IPX5 water resistance
- USB-C output can charge small devices
Cons
- Remote controller is not included
- Cruise mode and fall detection are unavailable
- Requires a 65W USB-C PD charger
- Only fits round seatposts from 25 to 35mm
Best for: short-distance commuters who want a compact assist unit with minimal bicycle modification.
The LIVALL PikaBoost 2 Lite is the simpler member of LIVALL's rear-wheel assist system. It uses the same basic idea as the 220Wh PikaBoost, attaching without extra wires and allowing the rider to switch between assisted and regular cycling without removing the device. For a short urban commute, that can be more appealing than a permanent wheel replacement and a bundle of controller cables.
The built-in battery is 158Wh, with a claimed assist range of up to 50km, or 31.07 miles, under ideal conditions. A full charge is listed at three hours with a 65W Type-C PD charger, but that charger is not included. The Type-C port can also provide up to 100W of output for a phone, bicycle light, or other portable device. The unit weighs 6.6 pounds and has the same listed 13.3 by 5.2 by 3.3-inch dimensions as the larger PikaBoost configuration.
The Lite version includes a mudguard, installation pack, Type-C charging cable, quick-start guide, and a built-in warning light. It has IPX5 water resistance for splashes and light rain. Those details make sense for an everyday commuter device, especially when the bicycle still needs to function as a normal bike after the battery is depleted.
The cuts compared with the larger PikaBoost are meaningful. The Lite version does not include a wireless remote controller, fall detection, or cruise mode. The seatpost restriction also remains: the bicycle needs a round seatpost between 25 and 35mm, and the product is not suitable for children's bicycles. It is an assist accessory rather than a complete electric bicycle, so it cannot replace the broader wheel, battery, and display choices of the hub kits.
The LIVALL PikaBoost 2 220Wh is the better option for longer rides and adds three assist modes plus app-based calibration. The Lite is the better fit for a rider who wants less hardware and a shorter daily route. If battery planning is the part that feels unclear, how battery capacity affects an electric bike ride is useful background before choosing between the two.
9. GOSHET 72V Rear Hub: Best High-Voltage Hub
Pros
- 72V, 2000W brushless gearless motor
- 27.5-inch rear-wheel format
- Claimed 60Nm torque
- LCD shows speed, mileage, and faults
- Includes cruise control and adjustable riding modes
Cons
- High-voltage setup demands careful battery matching
- Intended for a 7-speed flywheel
- The listing uses both nine-speed adjustment and a seven-speed flywheel description
Best for: technically confident builders creating a high-output 27.5-inch rear-wheel project.
The GOSHET 72V Rear Hub is not the quiet commuter option in this group. Its 72V, 2000W brushless gearless motor is aimed at a high-output conversion, with a claimed 560rpm speed and 60Nm of torque. The 27.5-inch wheel format gives the kit a defined starting point, unlike the multi-size Varstrom and BAFANG hub systems.
The motor uses a brushless, gearless design, which avoids brush replacement and internal gear service. The listing describes an aluminum rim, a multifunction LCD, a powerful controller, cruise control, and adjustable riding modes. The display can show speed, mileage, and faults, giving the builder a way to monitor the system after installation. The product description mentions nine-speed adjustment but also identifies a seven-speed flywheel, so drivetrain compatibility deserves special attention before ordering.
The supplied kit includes the main conversion components, including the controller bag and handles, along with an installation manual. That is useful for a complete build, but the presence of a controller does not remove the need to match the battery's voltage and current requirements. A 72V system is a more specialized electrical project than the 48V kits elsewhere in this list, and the donor bike needs brakes, tires, frame, and wheels appropriate to the intended output.
The headline output is also the source of the main limitation. A high-voltage rear motor can change the bicycle's acceleration, braking demands, and legal suitability for public roads. The BAFANG 48V Rear Hub is a more measured rear-wheel path, and the BAFANG BBS-HD 1000W is more compelling when the route requires climbing torque through the gears. GOSHET makes sense only when the rider has a clear reason for a 72V, 2000W build.
This kit is therefore less about a quick conversion and more about assembling a coherent system. Choose it for a 27.5-inch project when high output, cruise control, and a rear hub layout are central requirements. Skip it if the goal is a subtle assist system that behaves close to the original bicycle.
10. Ktaxon 48V Front Hub 24-inch: Best 24-Inch Conversion
Pros
- 48V, 1000W brushless gearless hub motor
- Designed for a 24-inch front wheel
- Four riding modes
- LCD tracks battery, speed, mileage, mode, and errors
- Power-cutoff brake handle included
Cons
- Battery is not included
- Requires 3 15/16-inch front dropout spacing
- Listed load support is up to 220 pounds
Best for: owners of smaller-wheel 24-inch bicycles who need a matching front hub conversion.
The Ktaxon 48V Front Hub 24-inch serves a specific but important purpose: it brings the basic Ktaxon front-wheel system to a smaller bicycle. The 48V 1000W brushless, gearless motor is installed in a 24-inch front wheel, leaving the rear gears and bottom bracket in place. For a compatible small-frame or compact bicycle, that is much more useful than trying to adapt a larger wheel kit.
The aluminum-alloy rim and high-carbon-steel spokes are listed with support for up to 220 pounds. The gearless hub design is intended to run quietly and with limited internal maintenance. As with the 26-inch Ktaxon, this is a cadence-based pedal-assist system rather than a torque-sensing one, so assistance is triggered by pedaling rather than closely following how hard the rider pushes.
Four modes are available: throttle, presets, PAS, and manual. The LCD display reports battery power, speed, mileage, mode, and error codes, while the power-cutoff brake handle interrupts power when the controller detects braking. That combination gives a new builder a clear interface and a basic safety response without requiring a more involved display ecosystem.
The fit requirement is the detail to verify first. This kit is intended for most 24-inch bikes with 3 15/16-inch front dropout spacing, and the battery is not included. The rider should also check fork construction, brake compatibility, tire width, battery mounting space, and cable routing. A correctly sized wheel does not guarantee a correct installation.
The Ktaxon 48V Front Hub 26-inch offers the same general system for a larger common wheel, while the BAFANG 48V Rear Hub covers more wheel sizes and keeps motor weight away from the steering. Choose this 24-inch Ktaxon when the donor bicycle's wheel size and dropout measurement match exactly. It is a focused conversion, not a universal one.
How to choose best ebike conversion kit
The right kit starts with the donor bicycle, not the motor label. Measure the wheel, axle spacing, bottom bracket, brakes, drivetrain, and available battery space before comparing output.
Motor position
Front hub motors are usually the simplest wheel replacement, but they add weight and pulling force to the fork. Rear hub motors provide power at the driven wheel and leave the front end unchanged, though cassette, freewheel, and dropout measurements become more important. Mid-drives sit at the crank and use the bicycle's gears, which helps on hills but makes installation and drivetrain condition more significant.
Torque sensing
A cadence sensor turns assistance on after it detects crank movement. That behavior is simple and appears in the Ktaxon kits. A torque sensor, as used by the Varstrom TSDZ-2B, responds to pedal force and can feel more progressive. Riders who want the motor to follow their effort closely should prioritize torque sensing. Riders who mainly want a throttle or predictable assistance can use a cadence-based system successfully.
The most powerful motor is not the right conversion if the bicycle cannot safely control it.
Wheel and dropout fit
A 24-inch wheel cannot substitute for a 26-inch wheel without changing the bicycle's geometry, and front and rear dropout widths are not interchangeable. The Ktaxon 24-inch kit requires 3 15/16-inch front spacing, while its 26-inch counterpart uses 3.93-inch front spacing. The BAFANG rear hub uses 135 to 142mm spacing, and the Varstrom options use several different front and rear widths. Measure the frame and fork with a ruler or caliper before ordering.
Bottom-bracket width
Mid-drive kits require accurate bottom-bracket measurements. The BAFANG BBS02B and BBS-HD support 68 to 73mm, 100mm, and 120mm options, while the Varstrom TSDZ-2B is listed for 68 to 73mm. The inner diameter and JIS standard can matter too. A kit that appears close but does not clamp correctly can create chain-line, alignment, and safety problems.
Battery and controller matching
Several kits in this roundup can be ordered without a battery, so the battery is part of the system design rather than an afterthought. Voltage must match the motor and controller. Current capability matters as well, especially for the Varstrom hub kit, which specifies a BMS above 30A when a battery is not included. Connector type, mounting location, weather protection, and charging arrangements all affect whether the finished bicycle is practical.
Frequently asked questions
Is a mid-drive or hub motor better for hills?
A mid-drive can use the bicycle's gears, which usually gives it an advantage on sustained climbs and changing terrain. Hub motors are simpler and can work very well on flatter routes. The BAFANG BBS-HD 1000W and Varstrom TSDZ-2B are the strongest climbing-oriented choices here, while the rear and front hub kits suit riders who want a simpler wheel conversion.
Do these conversion kits include a battery?
Not every kit includes a battery. The LIVALL PikaBoost versions have built-in batteries, while several BAFANG, Varstrom, Ktaxon, and GOSHET configurations specify that the battery may be optional or not included. Check the selected configuration and match voltage, connector, and battery management requirements before installation.
Can any bicycle use an ebike conversion kit?
No. Wheel diameter, front or rear dropout width, bottom-bracket dimensions, brake type, drivetrain, frame space, and battery placement all affect compatibility. The LIVALL PikaBoost also requires a round seatpost between 25 and 35mm, while the Ktaxon front kits require specific wheel and fork spacing.
Are front hub conversions easier to install?
They can be, because the rear cassette and crankset remain untouched. Front forks still need to be strong and correctly sized for the motor, and the added weight can change steering feel. A rear hub or mid-drive may be a better match for a bicycle whose front end is not suited to motor loading.
What is the difference between cadence and torque sensors?
A cadence sensor detects that the pedals are turning and then requests assistance. A torque sensor measures pedal pressure, so the motor response can rise and fall with the rider's effort. The Varstrom TSDZ-2B uses a torque sensor, while the Ktaxon systems list cadence-based pedal assist.
Can these kits be used in rain?
The products make different weather claims. The LIVALL Lite lists IPX5 water resistance, the Varstrom TSDZ-2B lists IP65 protection, and the BAFANG rear hub lists IPX5. Those ratings do not make every connector or battery mount waterproof, so the installation still needs careful cable routing and protection.
Does a more powerful kit always make a better conversion?
No. Higher output increases demands on the bicycle's frame, fork, brakes, drivetrain, battery, and controller. A modest hub kit can be the safer and more natural fit for a commuter, while a high-torque mid-drive or 72V hub makes sense only when the donor bike and intended route support it.
The bottom line
The LIVALL PikaBoost 2 220Wh is the Best ebike conversion kit for riders who want assistance without rebuilding the bicycle around a motor. Its seatpost restriction and separate charger requirement are real limitations, but its compact installation, larger integrated battery, app controls, and safety features make it the most approachable option here.
For a more traditional conversion, the BAFANG BBS02B Mid Drive offers the broadest configuration range, while the Varstrom TSDZ-2B Torque Sensor is the better choice for natural pedal response. Riders tackling steep terrain or heavy loads should move up to the BAFANG BBS-HD 1000W, and builders seeking a high-output project should consider the GOSHET only after checking every electrical and mechanical requirement.
If you are undecided, measure your bicycle first, then choose the least complicated kit that matches those measurements and your actual route.
As an Amazon Associate we earn from qualifying purchases.