In this review of the Bafang Hub motor , I will be looking at the Das-Kit Electric bike conversion kit, currently available from Amazon in the UK and EU.
These kits are supplied by Leon Cycle GmbH, a German company based in Hanover. Their kits use the proven Bafang geared hub motor. This compact electric motor uses planetary gears, which allow the motor to spin at high speeds, making it a lot more efficient than a larger direct drive motor.
Electric Bike Conversion Kit Review
Small geared hub motors produce significantly more torque, making them excellent for climbing hills. They are also easy to pedal with the power switched off, making them much more suitable for someone who only needs the power on hills.
A couple of negative factors with these motors, is that they produce a little more noise than direct drive hubs, and the nylon planetary gears can wear over time (especially if you are a heavier rider, or you carry heavy cargo). The good news is that replacement parts are cheap and fairly easy to replace for a DIY enthusiast.
The Das-Kit LCD display is clear and easy to use and offers 6 levels of pedal assist with ‘0’ being no assist to ‘6’ being full power. This is the exact same motor fitted to the NCM Electric mountain bike, reviewed elsewhere on this site.
This particular kit is available in rear wheel only format and is sold in 26″ / 27.5″ and 28″ wheel sizes, it will take a standard Shimano 7-speed screw-on freewheel gear block.
You will first need to check the wheel size of your bike. If you do not know the size, it can be found on the tyres: 26″ / 599 (ISO) 27.5 / 584 (ISO) 28″ / 622 (ISO) – PLEASE NOTE: If you are installing this kit on a 29er mountain bike, then you will require the 28″ (622) wheel size. For more information on tyre and wheel sizes check out this post by the great Sheldon Brown.
This kit is only compatible with standard rear drop-outs. It will not fit a bike with thru-axles. Nearly all cheaper bikes have standard quick-release drop-outs. But if you are thinking of installing this kit on a higher end mountain bike or road bike, you will need to double check.
You will also need to check the kind of bottom bracket your bike has fitted. If it is a standard square-tapered BB, there should not be a problem. If, however you have an Octalink / ISIS or Hollowtech ll type BB then you will need to purchase a separate gear sensor.
This particular hub motor is not compatible with cassette gears (usually 8/9/10 or 11 speed).
Hub motors, are, in my opinion the easiest solution for a fairly quick and easy electric bike conversion. There are several key components in this electric bike conversion kit:
- The wheel with the hub motor
- LCD Display
- Motor controller
- Wiring loom
- Throttle (optional to fit)
- Pedal assist sensor with magnetic disc
Fitting these kits, really couldn’t be easier. The only other essential item you will need to purchase is 36v battery. I will be writing a separate article on installation of hub motor kits.
Motor: Bafang 8FUN rear wheel gear hub motor (35Nm-45Nm max torque), silver, 36V 250W
Dimensions: Rear drop-out width for motor: 135mm, motor diameter: 160mm,
Gear fitment: Screw-on freewheel gear block (up to 7-speed) Not compatible with cassette gears 8/9/10/11 speed.
Brake disc rotor: 6-hole disc brake mount, also compatible with rim brakes.
Display & Throttle L6BT 2,5″ LCD display incl. back light, display extension cable approx. 1900mm, 6 AssistLevels, Thumb Throttle (fitting optional).
Controller: CT4 Controller 36V, Current 7A, maximum current 15A (1 Sec.),
Connections: Motor, Battery, Display, Front light up to 42V Controller dimensions: L x H x W = approx. 9,0 x 6,0 x 2,7cm.
Pedal assist disc: (12 magnets) Installation on the right side of the bottom bracket. For an installation on the left side, a special Hollowtech & Octalink Sensor is needed.
Distance from Pedal assist sensor to magnetic disc approx. 5-7mm
Wiring loom length approx. 950mm
Brake Levers: Artek brake levers, cut-off sensor on the left side
Spokes Stainless steel, silver Rim 26″ / 27,5″ / 28″ hollow-section rim
Black cable-ties included
Weight Rear wheel motor including rim: approx. 4,6kg
I decided to review the Bafang hub motor, as I have installed dozens of these kits in the past and they have proven time and time again to be the most reliable. As much as I like mid-drive motors, the simplicity and comparatively easy installation of hub motors wins the day for me. I have had customers use these motors on daily commutes for two years without any reported issues. Even if they go wrong (which they rarely do) repair is usually straightforward, and parts supply is plentiful.
With a 36v14.5ah battery fitted, you can expect an assisted range of between 25-40 miles, and considerably more if you are frugal with the pedal assist.
Throttle or not?
This is a matter of personal choice. It is legal to fit a throttle to a used bike in the UK and the EU – as long as the bike complies with the 250w / 15.5mph (25km/h) law.
If you have dodgy knees, then the throttle can be an invaluable asset in helping you to get moving. But over use or over reliance on the throttle can result in premature wear of the planetary gears and may cause the controller to overheat (especially when climbing a hill).
That’s it for this review, I will be doing more electric bike conversion kit reviews in future. In the meantime, I have compiled a price comparison chart for some of the best cheap electric bike conversion kits available.
Below is a selection of Bafang hub motor kits currently available from trusted suppliers on Aliexpress – all available for global shipping.
Bafang hub motor kits for sale 36v 250w - 48v 750w
Das-Kit 36v 250w Electric Bike Conversion Kit
Value for Money10.0/10
Ease of Installation9.0/10
- One of the best value 250w kits available
- Proven Bafang hub motor
- Virtually maintenance free
- Very reliable
- Road Legal in UK and EU
- Nylon gears can wear over time
- A little noisier than direct drive hubs