Best Electric Bike Conversion Kit: 5 Kits and What They Fit
IBy Ilias · Updated October 10, 2026 · Listings checked on Amazon.com
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In short
The best electric bike conversion kit here for a simple, lower-power build is the L-faster 450W chain drive kit, because its 450 W motor sits under the 750 W cap many states use and fits standard wheels. The deciding catch: it needs a rear V-brake and you must buy the battery separately.
Check priceOur pick: L-faster 450W Left Chain Drive Conversion Kit
OUR PICK
L-faster 450W Left Chain Drive Conversion Kit
Best for: DIY tinkerers with an old V-brake bike who want a cheap throttle-only conversion.
The only kit here with a motor figure under 750 W and a frame-mounted design that keeps your wheel, but it is a DIY job limited to rear V-brake bikes, with no battery.
Mounts the sprocket on the wheel spokes, so it can fit most standard bicycle wheels.
Motor freewheel means no motor drag when pedaling without power.
Choice of twist throttle with key switch or thumb throttle.
Specs taken from the product listings on October 10, 2026. –: not listed by the manufacturer.
The models in detail
This page is for riders who want to turn a bike they already own into an e-bike and need to know which kit matches their frame, brakes and wheels. We compared five kits from Amazon.com product listings checked on October 10, 2026, on motor, mounting position, wheel size and battery. Nobody here installed these kits, so fit and figures come from the product pages, and four of the five kits go beyond common e-bike power limits.
1 · Our pick
L-faster 450W Left Chain Drive Conversion Kit
Conversion kit3,8/5 from 160 Amazon customer ratings (as of October 10, 2026)
The L-faster kit takes a different route from the hub kits on this page: a 450 W brushed motor bolts to the frame and drives a sprocket fixed to the rear wheel spokes through a left-side chain. That keeps your own wheel, which the seller says lets it fit most standard bicycle wheels, and the motor freewheels so it does not drag when you pedal unpowered. At 450 W, it is the only kit here under the 750 W cap many states use, though the listing does not say whether that figure is rated or peak. You choose a twist throttle with key switch and battery indicator, or a thumb throttle. Compatibility is narrow: rear V-brake only, no disc or coaster brake, a hub diameter under 36 mm, and the bracket may need hand modification. No pedal-assist sensor is listed, and battery and charger are extra; the seller suggests 24 V 15 Ah or 36 V 12 Ah. It holds 3.8 stars from 160 reviews.
Pros, cons and specs
Pros
Mounts the sprocket on the wheel spokes, so it can fit most standard bicycle wheels.
Motor freewheel means no motor drag when pedaling without power.
Choice of twist throttle with key switch or thumb throttle.
Seller says a 26-inch bike reaches about 35 km/h with this kit.
Cons
Battery and charger are not included and must be bought separately.
Only for bikes with a rear V-brake (no disc or coaster brake) and a hub diameter under 36 mm; the motor bracket may need to be modified by hand.
No pedal-assist sensor is listed, and the power figure is not labeled rated or peak.
Best for: DIY tinkerers with an old V-brake bike who want a cheap throttle-only conversion.
Skip it if you want a plug-and-play kit with a battery, pedal assist, or disc brake compatibility.
Other specs
ControllerIncluded, with fuse wire and 3 fuses
ThrottleTwist (with key switch and battery indicator) or thumb, chosen at order
IncludedMotor, chain, custom sprocket, controller, mounting plate and bolts, throttle
A mid-drive kit replaces your crankset and powers the chain, so the motor works through your bike's gears instead of spinning a wheel. The BAFANG listing covers several versions under one product page: the BBS02B at 500 W or 750 W, and the BBS-HD at 1000 W, with 100, 120 or 160 Nm of torque. The 500 W and 750 W options stay at the cap many states use; the 1000 W BBS-HD goes beyond it, so check local rules before riding bike paths. Fit depends on your bottom bracket: 68-73 mm, 100 mm or 120 mm shells with a 33.5-36 mm inner diameter, on chain-driven bikes with disc or V-brakes, which the seller says includes MTBs, city bikes and recumbent trikes. Brake levers, chainwheel, thumb throttle, speed sensor, headlight and a bottom-bracket tool are included. The battery and display are optional, and the battery-free version needs your own 48 V pack with an XT60 connector. The 73 mm screws are not included. It holds 4.2 stars from 86 reviews.
Pros, cons and specs
Pros
Mid-drive kit in 500 W, 750 W (BBS02B) or 1000 W (BBS-HD) versions with 100/120/160 Nm of torque.
Fits bottom brackets of 68-73 mm, 100 mm and 120 mm (33.5-36 mm inner diameter), including MTBs, city bikes and recumbent trikes.
Comes with brake levers, chainwheel, thumb throttle, speed sensor, headlight and a bottom-bracket tool; Bafang displays can be tuned via the BAFANG GO app.
Cons
Battery and display are optional extras; the 'without battery' option needs your own 48 V pack with an XT60 connector.
The 1000 W BBS-HD version is above the 750 W / 28 mph limits most US states use for e-bikes; check local rules before riding on bike paths.
Only for chain-driven bikes with disc or V-brakes, and 73 mm screws are not included.
Best for: Experienced DIY builders who want a mid-drive conversion that uses the bike's own gears.
Skip it if you want a plug-and-play kit with battery and display included at one price.
Other specs
ThrottleThumb throttle
DisplayOptional CAN displays (VD03, EKD01, VD04, VD618, VD18MT, DPC010, DPC080)
This NBPOWER kit is built for speed, not bike paths. The 72 V 2000 W rear hub motor comes laced into an MTX33/39 double-wall disc-brake rim, with a 48-72 V 45 A dual-mode sine wave controller, an SW900 color display, a full twist throttle, cut-off brake levers, a pedal-assist sensor with 8 magnets and a 7-speed freewheel. Of the five kits on the page, this one has the most complete electronics. The seller quotes 70-75 km/h, which with 2000 W puts it far past the 750 W and 28 mph limits most states use for e-bikes; treat it as an off-road or private-land machine and check local rules. Fit needs a 135 mm rear dropout and a frame strong enough for this power, and wheel size depends on the variant you select. No battery is listed as included: the seller only suggests a 72 V 20 Ah pack, which adds to the total cost. It holds 4.0 stars from 69 reviews.
Pros, cons and specs
Pros
Complete rear wheel with a 72 V 2000 W hub motor laced into a double-wall disc-brake rim.
48-72 V dual-mode sine wave controller (45 A) and an SW900 color display.
Includes twist throttle, cut-off brake levers, a pedal-assist sensor, and a 7-speed freewheel.
Seller states stock in a Los Angeles warehouse.
Cons
Listed at 70-75 km/h and 2000 W, above the 750 W / 28 mph limits most US states use for e-bikes; check local rules before riding on bike paths.
No battery is listed as included; the seller only suggests pairing it with a 72 V 20 Ah pack.
Requires a 135 mm rear dropout and a frame strong enough for this power.
Best for: Experienced builders converting a sturdy frame for private-land or off-road use.
Skip it if you want a street-legal e-bike conversion or a kit that includes the battery.
Other specs
Controller48-72 V 45 A dual-mode sine wave, 18 MOSFET
ThrottleFull twist
DisplaySW900 color multifunction display
Brake leversTwo alloy levers with motor cut-off
IncludedLaced wheel on MTX33/39 double-wall rim (disc brake), 7-speed freewheel, 1:1 PAS sensor with 8 magnets
The 52 V NBPOWER kit shares its 2000 W rating and 135 mm rear dropout requirement with the 72 V version, but offers the widest wheel range on this page: 20, 24, 26, 28, 29 in or 700C. That makes it the only kit here listed for 20 in wheels. A 52 V 40 A sine wave controller with cruise function, a KT LCD8H color display, a thumb throttle, an 8-magnet pedal-assist sensor, a 7-speed freewheel and a torque arm are included. The torque arm is worth having on a powerful hub motor. The listing mentions CE, CCC, EN15194 and ISO 9001-2000 certificates. The catches mirror its sibling: the seller claims about 60-65 km/h, beyond the 750 W and 28 mph limits most states use, so check local rules, and rated versus peak power is not separated. No battery appears in the kit contents, so total cost and range are unknown until you choose one. Check your dropout and wheel size before ordering. It holds 4.0 stars from 47 reviews.
Pros, cons and specs
Pros
The kit pairs a 52 V 2000 W rear hub motor with a 40 A sine wave controller that includes cruise control.
A KT LCD8H color display, thumb throttle and 8-magnet pedal assist sensor are included.
The motor is laced into a double-wall aluminum alloy rim and comes with a 7-speed freewheel and a torque arm.
The listing mentions CE, CCC, EN15194 and ISO 9001-2000 certificates.
Cons
No battery appears in the kit contents, so the full cost and range are unknown.
The listing claims about 60-65 km/h, above the 750 W / 28 mph limits most US states use for e-bikes; check local rules before riding on bike paths.
The listing does not separate rated and peak power, and the rear dropout must be 135 mm.
Best for: Experienced home mechanics who want a high-power rear hub conversion and already plan to source a 52 V battery.
Skip it if you want a street-legal Class 1-3 e-bike or a plug-and-play kit with a battery.
Other specs
Controller52 V 40 A, 12 MOSFET sine wave, cruise function
ThrottleThumb
DisplayKT LCD8H color LCD
Brake levers1 pair, aluminum alloy
IncludedWheel motor, controller and bag, brake levers, thumb throttle, 8-magnet PAS sensor, 7-speed freewheel, torque arm, manual
If you ride a road, gravel or hybrid bike with 700C, 28 in or 29 in wheels, this MIOUYTRT kit targets that size specifically. It is a 48 V 1000 W brushless gearless hub laced into an aluminum rim, with a listed wheel load of up to 264 lbs. The dual-mode controller can keep the motor running in non-Hall mode if a Hall sensor fails, and the LCD shows speed, average and max speed, trip and total mileage, with five assist levels and cruise. The seller quotes 45-55 km/h (28-34 mph), and 1000 W is above the 750 W cap most states use, so check local rules before riding bike paths. The title says front or rear, but the seller FAQ says rear wheels only. Battery, charger and tires are not included; a 48 V 13 Ah or larger pack is recommended. The included levers suit mechanical brakes, so hydraulic setups need separate wiring for the cut-off. It holds 3.9 stars from 44 reviews.
Pros, cons and specs
Pros
1000 W brushless gearless hub motor in a 700C / 28-29 inch aluminum rim, with a listed wheel load of up to 264 lbs.
Dual-mode controller keeps the motor running in non-Hall mode if a Hall sensor fails.
LCD shows speed, average and max speed, trip and total mileage, battery and assist level, with 5 assist levels and cruise.
Cons
Battery, charger and tires are not included, so the real cost and weight depend on the battery you add.
The seller quotes 45-55 km/h (28-34 mph) with a 1000 W motor: above the 750 W / 28 mph limits most US states use for e-bikes; check local rules before riding on bike paths.
Included brake levers are for mechanical brakes; hydraulic setups need the original levers and wiring the cut-off separately.
Best for: DIY riders converting a 700C, 28 or 29-inch bike who already have or will buy a 48 V battery.
Skip it if you want a legal Class 1-3 setup out of the box or need a front-wheel kit.
Other specs
ControllerDual-mode (Hall / non-Hall)
DisplayLCD with cruise function
Brake leversIncluded, motor cut-off (for mechanical brakes)
Decide where the motor goes first, because it sets how hard the install is and how the bike rides. Three kits here are rear hub motors laced into a new wheel: the two NBPOWER kits and the MIOUYTRT. You swap the rear wheel and run the wiring. The BAFANG is a mid-drive that replaces your crankset and drives the chain, so it uses your bike's gears. The L-faster mounts a motor on the frame and drives a sprocket on your existing spokes through a second chain. Hub kits are usually the most direct swap if your dropout matches.
Frame and brake compatibility
Measure your bike before you order, because each kit fits only some frames and brake types. The L-faster needs a rear V-brake and a hub under 36 mm; disc and coaster brakes are out. The BAFANG needs a 68-73 mm, 100 mm or 120 mm bottom bracket on a chain-driven bike with disc or V-brakes. Both NBPOWER kits need a 135 mm rear dropout, and the MIOUYTRT is for rear wheels only. Compare those figures with your own frame, and if a listing is vague, ask the seller with photos of your bike before buying.
Wheel size
Order the hub kit in the exact wheel size of your bike, since the motor comes already laced into a rim. The 52 V NBPOWER lists 20, 24, 26, 28, 29 in or 700C options, the widest choice here. The 72 V NBPOWER mentions 26, 27.5, 28, 29 in and 700C depending on variant. The MIOUYTRT covers 700C, 28 in and 29 in only. The BAFANG mid-drive and the L-faster keep your own wheels, so wheel size matters less, though the L-faster sprocket must fit your spokes. Tires are not included with the MIOUYTRT, so reuse yours or buy new ones.
Motor power and legal limits
Pick the power you can legally ride, because most kits here exceed common e-bike rules. Many states cap e-bike motors at 750 W, and the class system limits assist to 20 mph for Class 1 and 2 and 28 mph for Class 3. Only the 450 W L-faster and the 500 W or 750 W BAFANG BBS02B versions stay at or under that cap. The 1000 W BAFANG BBS-HD, the 1000 W MIOUYTRT and both 2000 W NBPOWER kits go beyond it, and the sellers quote speeds above 28 mph for several of them. Check your local rules before riding these on bike paths.
Battery and what else to buy
Budget for a battery, because none of these kits clearly includes one in its standard listing. The L-faster runs on 24 V or 36 V, and the seller suggests 24 V 15 Ah or 36 V 12 Ah. The BAFANG offers 48 V or 52 V packs as options, or needs your own 48 V pack with an XT60 connector. The 72 V NBPOWER suggests a 72 V 20 Ah pack, the 52 V version needs a 52 V battery, and the MIOUYTRT recommends 48 V 13 Ah or more. Match voltage exactly, and add a charger, tires or a display where the kit leaves them out.
Install skills and controls
Be honest about your tools and skills, since a conversion is a mechanical and electrical job. The L-faster may need its bracket modified by hand. The BAFANG requires removing your bottom bracket, though a removal tool is included. Hub kits mean swapping a wheel, fitting a torque arm on high-power motors, routing cables and installing cut-off brake levers. Controls differ too: the L-faster is throttle only with no pedal-assist sensor listed, while the NBPOWER, MIOUYTRT and BAFANG kits include a pedal-assist or speed sensor. If you are unsure, have a bike shop review the fit before you order.
Skip it if…
you expect a plug-and-play kit with a battery included, since every kit here leaves the battery out or makes it optional.
your bike has disc or coaster brakes and you were looking at the L-faster.
you want a street-legal conversion and are considering the 2000 W NBPOWER kits.
you have never worked on a bottom bracket or laced wheel and have no shop to help.
your frame is a light road or carbon frame not built for a powerful hub motor.
FAQ
What is the best electric bike conversion kit?
The L-faster 450W chain drive kit is our pick for a simple build that stays under the 750 W cap many states use. It keeps your wheel and fits most standard wheels, but only on bikes with a rear V-brake and a hub under 36 mm, and the battery is extra. For a mid-drive that uses your gears, the BAFANG BBS02B is the alternative.
Is a hub motor or mid-drive conversion kit better?
It depends on your bike and skills. A rear hub kit, like the NBPOWER or MIOUYTRT kits here, swaps in a new wheel and is the more direct install if your 135 mm dropout or 700C size matches. A mid-drive like the BAFANG drives the chain through your gears, which helps on hills, but requires removing your bottom bracket and matching its width.
Do e-bike conversion kits include a battery?
Not by default for the five kits on this page. The L-faster, both NBPOWER kits and the MIOUYTRT do not list a battery in their contents, and the BAFANG offers 48 V or 52 V packs only as an option. Each seller suggests a voltage, such as 36 V 12 Ah for the L-faster or 48 V 13 Ah or more for the MIOUYTRT. Budget for it.
Is a converted ebike legal on bike paths?
Only if the finished bike meets your state's e-bike rules. Many states cap motors at 750 W and limit assist to 20 mph for Class 1 and 2 or 28 mph for Class 3. The 450 W L-faster and the 500 W or 750 W BAFANG versions stay at that cap; the 1000 W and 2000 W kits here go beyond it. Check local rules.
Will an electric bike conversion kit fit my bike?
Only if your frame matches what the listing states, so measure first. Check the rear dropout width for hub kits (135 mm for both NBPOWER kits), the bottom bracket width for the BAFANG (68-73 mm, 100 mm or 120 mm), your wheel size, and your brake type. The L-faster needs a rear V-brake, and the MIOUYTRT fits rear 700C, 28 in or 29 in wheels only.
I
Ilias, eBike Compas
Models are picked from the product listings on Amazon.com, recorded and dated. Missing data is flagged instead of guessed, and no hands-on test is described unless it actually happened. Our method