Home › Display settings › Mahle X35 / X20 (iWoc button, My SmartBike app) › Mahle: walk assist

How to use walk assist on a Mahle X20 (and why the X35 has none)

Mahle X35 / X20 (iWoc button, My SmartBike app)

The X20 has walk assist via the iWoc (or Pulsar / app); the original X35 does not.

Step by step

  1. X20: with the bike on, press the iWoc twice quickly then hold; the LED turns blue and the motor pushes at about 6 km/h.
  2. Release to stop. Brake levers are not connected on most Mahle bikes, so keep the button as the only control.
  3. Pulsar Two: hold the '-' button for 2 seconds.
  4. App: on the bike screen tap 'Walk' and hold the on-screen button.
  5. X35: no walk assist on any firmware.
Tip: Walk assist on a light X20 road bike is more than enough; on a heavy trekking bike it struggles on steep ramps.

Can't find it?

If the LED does not go blue, update firmware; walk assist arrived in the X20 firmware of 2023.

Frequently asked

Walk assist on the X35 through the app?

No.

Is it legal in the EU?

Yes, up to 6 km/h.

The bike jerks in walk assist.

Wheel-speed sensor gap too big; a dealer adjusts the sensor.

Manuals and video

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: speed limit
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.