All the connections matched. A bit of searching for which one I needed. The service was friendly.
V20 Pro Skinny Bike Tunable Controller 21A (Red Plug)




Ordered before 23:59, delivered tomorrow
- Tested on a fatbike before shipping
- Easy to install
- Home delivery across the EU
- Not happy? Money back, 14-day cooling-off period
- Fits: V20 Pro Skinny Bike
Step by step How do I check my motor plug colour?
How to check which motor plug colour your fatbike has
All you need is a pair of wire cutters and it takes a minute. The colour is on the inside of the motor plug, so you'll need to pull it apart. That's fine: it won't damage the plug.
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Go to the rear wheel
Put your fatbike on its stand. The motor is in the rear wheel, and one thick cable comes out of it: the motor cable.
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Follow the motor cable to the plug
The motor cable runs along the frame to the first plug. It's usually held in place with two cable ties. Cut the first one.
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Cut the second cable tie too
Now the plug hangs free and you can get a good grip on it.
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Hold the plug on both sides
Hold it by the thick plug housings, not by the thin wires.
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Pull the plug firmly apart
It's a tight fit, so don't be afraid to pull hard. The plug won't break.
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Look at the inside
Where the pins stick out you'll see the colour: red or black. That's your motor plug colour.
This controller only fits if the inside of your fatbike's motor plug is this colour. Not sure? You can check it in 1 minute.
Frequently bought together

Customer Reviews
Worked right away after connecting. Glad it was so simple . Hats off.
Exactly the right controller for the V20 Pro Skinny.
Works right away on my V20 Pro Skinny.
At the campsite the V20 Pro Skinny rides fine now.
Product information
The benefits at a glance
- Tunable up to 45 km/h
- Restricted: 6 km/h throttle
- 5 cables, no alarm
- Suitable for: QMWheel V20 Pro Skinny Bike (narrow tyres) with red motor cable
- Version: 21A, 500W, red motor plug, 5 cables without alarm connector
- Speed: tunable up to 45 km/h off public roads, delivered limited
The Skinny Bike is a V20 Pro on narrow tyres; the motor and the red motor plug are identical to those of the regular V20 Pro. This controller therefore delivers exactly the same control and reaches 45 km/h together with a tunable H6C display with killswitch.
Without a tunable display nothing changes about the speed: the controller is delivered limited and then stays at 25 km/h. If your Skinny Bike has a black motor plug, this model does not fit; do the Colour Check before you order. Fitting: remove the saddle, move five plugs over.
Fitting a new controller on your QMWheel V20 Pro Skinny Bike is actually very simple: there are only 5 cables you need to connect. Still not working out? Just message us on WhatsApp at 06 82090642 and we will help you out quickly.
Pro tip: take the saddle off the bike first, that way you can easily reach the controller to replace it.
WhatsApp chat only. We can't take calls, not even via WhatsApp.
Important: this controller is intended for the QMWheel V20 Pro Skinny Bike and only works in combination with a red motor cable. Do you have a different fatbike model? Then you need a controller that matches it. On our site you will find the right controller for your model.
Difference between restricted and tunable: it is in the software, not in the number of amps.





