Mahle X35 / X20 assist cut-off (25 km/h EU, 20 mph US) and why it cannot be changed by the rider
Mahle drives are set per market: 25 km/h in the EU, 20 mph (class 1) or 28 mph (class 3) in the US. The rider app has no speed setting; a dealer can only change it within the bike's type approval.
Step by step
- Check the setting: My SmartBike > bike > 'Info' shows the max assist speed.
- Confirm on a ride; the motor fades out over the last 2 km/h before the limit.
- A change (import from US to EU or the reverse) is done by a Mahle dealer with the service tool.
- Do not use a tuning dongle; the X20 detects implausible speed and stores an error, which voids the warranty.
Tip: The X35 has almost no drag above 25 km/h, so a road bike with X35 rides like a normal bike above the limit.
Can't find it?
There is no speed setting in the rider app on any version.
Frequently asked
Can a dealer set 32 km/h in Europe?
No; above 25 km/h needs type approval, plates and insurance.
My X35 cuts out at 23 km/h.
Wheel circumference set wrong in the service tool after a tyre change; dealer fix.
Is there a class-3 X20?
Yes for the US; set by the bike manufacturer.
Manuals and video
Videos found on YouTube and checked automatically; they are other people's work, not ours.
- Mahle Ebikemotion X35, X35+ motor limit release tuner Coral C.
- Come installare kit sblocco velocità SpeedFun Ghost tuning ebike per Mahle Ebikemotion X35 e X35+ SpeedFun tuning ebike
- E-Bike Tuning - SpeedFun Ghost for Mahle Ebikemotion X35 and X35+ ++ Mehr Speed! PhyberX
Other Mahle X35 / X20 (iWoc button, My SmartBike app) guides
Mahle: connect the My SmartBike appMahle: firmware updateMahle: assist levels and customisationMahle: switch mph to km/hMahle: lightsMahle: walk assist
Still stuck? Take a photo of the display and show it to a local e-bike workshop. Bring the bike's system name (e.g. Bosch Performance Line CX) and the exact code; that saves diagnostic time and money.