Belgium GO Swissdrive Ebikes Have 11mm Torque Arms On 10 mm Axles.

The original torque arm was 11 mm between flat sides. I've been using a 10 mm open wrench to turn the axle, hard steel which isn't all that mangled.

The axle was designed for a 10 mm torque arm.

The slack from the loose torque arm allows the motor to build up momentum before engaging. The impact destroys the torque arm and rips the heavy duty power wires out of the circuit board.

Someone put the wrong torque arm on possibly a lot of GO Swissdrive ebikes.

If you find one at a good price buy it! Look for Gub and possibly other bike frames.

You'll need a 260 watt soldering gun and Fast Chip desoldering alloy to reduce the melting temp of the solder. The wires enter the board on the left side and are soldered on the right, "through board."

And don't forget to machine a 10 mm torque arm.

Or just tape a cheap 10 mm wrench to the chain stay.


Bret Cahill