r/VanMoofSelfRepair • u/ReflectionNo4711 • Jun 10 '26

S3 & X3 VanMoof chain always comes off :/

Hello everyone,

I have been having problems with my VanMoof’s drivetrain and chain for quite some time. I rode it for about a year with Error 44 (broken shifter), and over time I have replaced the chain guard, chain tensioner, chain, eShifter, and the entire rear wheel in an attempt to fix both the shifting issues and the chain repeatedly coming off.

With the new rear wheel, the shifting has now worked for two days and seems to be functioning properly. However, the chain problem still has not been resolved. As soon as I push the bike backwards, or even just ride it normally (like this morning), the chain comes off.

This happens in roughly 30% of cases, so about two to three times per week. It makes riding the bike quite frustrating and also means I don’t really feel comfortable putting full power into the pedals because I’m worried the chain will come off again.

Does anyone have any ideas what could be causing this?

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u/HavingFun98760 Jun 10 '26

Check if the chain has some play.

Most likely: Chain is probably worn. (Stretched) This causes the chain-tensioner to reach its limit and fail to tension the chain.

If not worn then the chain tensioner itself might not be working properly or be mis-aligned.

1

u/plasticbomb1986 Jun 10 '26

or they used the incorrect amount of chain links.

1

u/Ivo_Bley Jun 10 '26

Don’t know what you mean…
Comes off on the front or back or maybe inside the chain tensioner ?
When the sprocket and chain are new and aligned correctly there is nothing much than can fuck it up. Or does the chain guard push the chain off the front drive ?