S20 Pro Tunable Controller 21A (Red Motor Plug)

QMWheel S20 Pro tunable controller 21A with red motor plug (photo 1)
QMWheel S20 Pro tunable controller 21A with red motor plug (photo 2)
QMWheel S20 Pro tunable controller 21A with red motor plug (photo 3)
QMWheel S20 Pro tunable controller 21A with red motor plug (photo 4)
Sale price 97,- Regular price 130,- Save 25%

Ordered before 23:59, delivered tomorrow

Build your tuning set
Together
  • Tested on a fatbike before shipping
  • Easy to install
  • Home delivery across the EU
  • Not happy? Money back, 14-day cooling-off period
  • Fits: S20 Pro
For the red motor plug Wrong colour? Then the plug won't fit.
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.

1 minute Just wire cutters No experience needed
  1. Fatbike on its stand, with the motor in the rear wheel

    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.

  2. Cutting the cable tie around a fatbike's motor cable with wire cutters

    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.

  3. Cutting the second cable tie at the motor plug

    Cut the second cable tie too

    Now the plug hangs free and you can get a good grip on it.

  4. Holding a fatbike's motor plug by hand

    Hold the plug on both sides

    Hold it by the thick plug housings, not by the thin wires.

  5. A fatbike's motor plug pulled apart, with the pins visible

    Pull the plug firmly apart

    It's a tight fit, so don't be afraid to pull hard. The plug won't break.

  6. Red inside of a fatbike motor plug with pins

    Look at the inside

    Where the pins stick out you'll see the colour: red or black. That's your motor plug colour.

Done? Push the plug firmly back together (the pins only fit one way) and, if you like, put a new cable tie around it.
For the red motor plug

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

Based on 5 reviews
5 reviews
V. HuismanVerified
Fine product

Our S20 Pro runs like it used to again.

HansVerified
Found the right one

The cables came out exactly right. It all went smoothly.

DeryaVerified
Saves money

Set it up exactly as explained on the site. I got a proper reply to my email. Completely satisfied.

dinieVerified
Nicely helped

For the S20 Pro this was the right one. Not quiite the same shade as in the photo.

A. KuipersVerified
Simple

The S20 Pro starts up normally again.

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 S20 Pro with red motor cable
  • Version: 21A, 500W, red motor plug, five connections
  • Speed: up to 45 km/h tuned on private terrain, factory limited to 25 km/h

The S20 Pro is the city version of the V20 family and has the same 500W motor with red plug. With this controller plus a tunable H6C display with killswitch your S20 Pro goes up to 45 km/h; via the killswitch you switch it back to 25 km/h in an instant.

This part is only intended for an S20 Pro with red motor plug; if your plug is black, this is the wrong controller. Fitting consists of removing the saddle and moving five plugs over. Riding tuned is only allowed on closed-off terrain.

Good to know

Fitting a new controller on your QMWheel S20 Pro 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.

Please note

Important: this controller is intended for the QMWheel S20 Pro 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.

Software

Difference between restricted and tunable: it is in the software, not in the number of amps.

QMWheel S20 Pro tunable controller: up to 45 km/h on private property

The controller is the brain of your QMWheel S20 Pro. It drives the motor and decides how much assistance you get. This version has a red motor plug and delivers 500W. It is supplied restricted and is tunable up to 45 km/h.

You order this controller from FatbikeKlaar.nl; the same part can also be ordered through FatbikeKlaar.be for Belgium and through FatbikeKlaar.com in English.

Which bike is this controller for?

This controller is intended for the QMWheel S20 Pro. That is the fatbike with 20 inch wheels, a 48V / 18Ah / 864Wh battery and dual rear suspension. The controller only works in combination with a red motor cable. So first check the plug between the motor and the controller. If it is black, this controller will not fit.

Did you order the S20 Pro in the Tunable version? Then this controller is already included. You order it separately to replace a faulty or damaged controller, or if you want to tune a restricted S20 Pro later.

What the controller does

Specifications

  • Motor plug: red.
  • Power: 500W.
  • Connections: 5 cables, no alarm.
  • Supplied: restricted, with a throttle up to 6 km/h as walk assist.
  • Speed: tunable up to 45 km/h.

Restricted or tuned

In restricted mode the S20 Pro is an electric bike with pedal assist up to 25 km/h. You then do not need a driving licence, number plate or helmet. If you switch the bike to tuned mode, those rules no longer apply and it does not belong on the public road.

Tuning: what is possible and what is allowed

For 45 km/h you also need the tunable H6C display in addition to this controller. You activate the higher speed with a tuning code. Using the kill switch on that display, you switch back to 25 km/h. Separate tuning parts are in the tuning kits. You can read the step-by-step guide in Tuning the QMWheel V20, V20 Pro or S20. Riding tuned is only allowed on private or enclosed property; on public roads a maximum of 25 km/h pedal assist applies.

Fitting it yourself

Replacing a controller is less difficult than it sounds. This is how you go about it:

  • Switch the bike off before you start.
  • Remove the saddle from the bike, so you can easily reach the controller.
  • Take a photo of the old connections before you disconnect anything.
  • Connect the 5 cables to the new controller one by one.
  • Then test the bike in restricted mode first.

Still not working out? Message us on WhatsApp at 06 82090642 and we will help you further.

Warranty, delivery and service

Parts from FatbikeKlaar come with a manufacturer's warranty. If you run into a problem, we will help you further. Order in the Netherlands before 23:59 and you will have the controller at home tomorrow. Delivery to Belgium and Germany is also possible. Not sure whether the part matches your old controller? Then compare the plug colour and the number of connections before ordering.

Matching parts for the S20 Pro

  • Display: the tunable H6C display above, needed for 45 km/h and the kill switch.
  • Battery: note the specifications 48V / 18Ah / 864Wh and then look at the batteries.
  • Charger: you can find a charger for a 48V battery among the chargers.
  • Other parts: controllers, displays and other parts for the QMWheel family are in V20 Parts.

Advice and product finder

Not sure which tuning part fits your bike? The product finder lists the matching controller and display per model. General questions about ordering and warranty are answered in the frequently asked questions. You can get personal advice via WhatsApp at 06 82090642.

Frequently asked questions about the S20 Pro controller

Does this controller fit every S20 Pro?

It fits the QMWheel S20 Pro with a red motor plug. Check the plug colour and the number of connections before you order.

Can I ride 45 km/h with just this controller?

No. You also need the tunable H6C display. With it, you activate the higher speed using a tuning code.

Am I allowed to ride tuned on public roads?

No. Riding tuned is only allowed on private or enclosed property. On public roads you set the bike back to 25 km/h with the kill switch.

Do I have to fit the controller myself?

Yes, you receive it as a separate part in compact packaging. You first remove the saddle from the bike and then connect 5 cables. If you cannot work it out, send us a WhatsApp message.

About the QMWheel S20 Pro controller with red motor plug

Please note: tuning is only intended for use on private or enclosed property. On public roads in the Netherlands and Belgium, a maximum of 25 km/h applies.

This is a separate controller for the QMWheel S20 Pro. It drives the motor and only works with a red motor plug. The controller has 5 connections without alarm and is supplied restricted, with a throttle up to 6 km/h. It comes in compact packaging and you fit it yourself. If you want to tune the S20 Pro, you also need the tunable H6C display.

Specifications

  • Suitable for: QMWheel S20 Pro
  • Brand: QMWheel
  • Motor plug: red
  • Version: 500W
  • Connections: 5, without alarm
  • Delivery: restricted, throttle up to 6 km/h
  • Tunable: up to 45 km/h, only on private or enclosed property
  • Item number: FBK-CTR-S20PRO-OV-RD-01

Fits

  • QMWheel S20 Pro with a red motor plug

Does not fit

  • S20 Pro with a black motor plug: there is a separate controller with black motor plug for it
  • Fatbikes with a motor plug in a colour other than red

In the box

  • 1 controller with red motor plug and 5 connections, in compact packaging

Questions about this product

Which display goes with this controller?

The tunable H6C display with 5-pin connection, with or without NFC. Only choose NFC if your current display has an NFC screen.

My S20 Pro has a black motor plug. Does this controller fit then?

No, this controller only works with a red motor plug. For a black plug there is a separate controller for the S20 Pro.

When will I receive the controller?

In the Netherlands: order before 23:59, delivered tomorrow. We ship parts free of charge to the Netherlands, Belgium and Germany from €150.

What warranty do I get on this controller?

The controller has a 2 years warranty. If something is wrong, contact us via WhatsApp: +31 6 82090642.

Can I exchange the controller?

Yes, you can exchange it. Contact us first via WhatsApp: +31 6 82090642. The return shipment is at your own expense.