Need to pick between two rear-wheel e-bike conversion kits? The decision comes down to wheel size, voltage, and what you want for your money. One kit is a 72V 27.5-inch rear-wheel package with a 2000W motor and LCD display; the other is a 20-inch 7-speed rear hub motor wheel. Their specs and listed prices sit far apart.
Quick verdict
The 72V kit is for riders who want a larger 27.5-inch wheel, a 72V system, a 2000W motor, and a bundled LCD display. The 20-inch kit is for a smaller-frame bike and a lighter rear wheel, and it carries the lower listed price.
At a glance
| Spec | 72V 27.5" 2000W Kit | 20" 7-Speed Kit |
|---|---|---|
| Listed price | USD 309.52 | USD 164.07 |
| Wheel size | 27.5 inch | 20'' x2.125 |
| Motor | 72V, 2000W, 560rpm, 60N.m | Brushless gearless hub, max 35N.m, max 420rpm |
| Gearing | 9-speed flywheel | 7-speed freewheel |
| Package extras | LCD display, controller, throttle, PAS sensor, brake lever | Wheel with tire and tube, 7-speed freewheel |
| Weight | Net 12.2kg / gross 14kg | Rear wheel 8.5kg |
Where each wins
72V 27.5" 2000W Kit wins if you need:
- Higher system voltage (72V) and power (2000W)
- Larger 27.5-inch rear wheel
- LCD display, controller, pedal assist sensor, and throttle in the box
- Higher torque spec (60 N.m)
20" 7-Speed Kit wins if you need:
- Lighter rear wheel (8.5kg)
- A wheel sized for 20'' x2.125 tires
- A simpler package centered on the wheel, tire, and tube
- A more compact 20-inch format
Product notes
72V E-Bike Motor 27.5" Rear Wheel LCD Electric Bicycle Conversion Kit 2000W
This kit pairs a 27.5-inch rear wheel with a 72V 2000W motor and a 9-speed flywheel. The included LCD display, controller, ordinary throttle, pedal assistant sensor, and power-off brake lever are part of the package. The motor is rated at 60 N.m torque and 560rpm, and the package gross weight is 14kg/30.86lbs. The wheel width is listed as 39mm/1.53 inch and the wheel diameter is 57.3cm/22.56 inch. A controller bag and English manual are also listed among the included accessories. The trade-off is the larger 27.5-inch wheel and the higher power target.
20" E-Bike Rear Wheel Motor, Electric Bicycle Conversion Kit +7-speed Freewheel
This kit is the more compact 20-inch rear-wheel option with a brushless gearless hub motor and a 7-speed freewheel. The wheel, tire, and tube are included, and the hub motor is rated for a max speed of 0-40km/h. The listed specs include max torque of 35 N.m and support for standard 6-hole disc brakes. The rear wheel weight is 8.5kg. The package description centers on the wheel itself, with the 7-speed freewheel included. This makes it a more focused starting point for a 20-inch build. The trade-off is the smaller 20-inch wheel format and the lower peak output.
Final choice by use case
Pick the 72V 27.5" 2000W Rear Wheel LCD Electric Bicycle Conversion Kit when you want a 72V, 2000W rear wheel with a display and the full accessory set at USD 309.52. Pick the 20" E-Bike Rear Wheel Motor, Electric Bicycle Conversion Kit +7-speed Freewheel when a 20-inch wheel and a listed price of USD 164.07 matter more.
