Bionx freehub crumbled away.

invert82 · Mar 25, 2017

While replacing my cassette, the freehub body on the hub motor literally crumbled away on me.

Bionx have told me I need a new motor which seems crazy for a simple part like that, has any one had any success replacing the free hub on one of these Bionx P 250 and know which free hub I would need to replace it with?

amberwolf · Mar 25, 2017

You'd need the one from BionX, so if they aren't supplying them as separate parts, you'd have to find another BionX motor with the same part on it, and swap it over.

Matador · Mar 25, 2017

Or you can try to cast a mold and melt aluminium into it....

Voltron · Mar 25, 2017

The problem is that the fixing bolt for the freehub is blocked until the axle is taken out, and the Bionx motor is press fit together so very hard to disassemble. Bummer design flaw....

MadRhino · Mar 26, 2017

You could just fit and screw a freewheel threaded mount on the cover. Then, it should not be that hard to find a scrap motor like yours, and take the right cover to replace yours.

Voltron · Mar 27, 2017

Depending on where you are I have a couple of Bionx motors I would seel cheap...

Chalo · Mar 27, 2017

MadRhino said:
You could just fit and screw a freewheel threaded mount on the cover.

Bionx uses torque transmitted through the freehub as a PAS signal. Using a threaded freewheel mounted to the side cover would disable that system at least.

MadRhino · Mar 27, 2017

Ah! True it would disable the torque sensor. Still, it would be running on the throttle until the OP finds a used motor. Now, it seems that he had already. Bionix are making everything they can, to prevent users from fixing or mod their system by themselves.

flat tire · Mar 27, 2017

It's a 250 watt motor so I guess this doesn't really apply, but on my last couple builds I didn't even bother putting on a chain.

invert82 · Mar 28, 2017

Thanks for all the advice guys, has been really helpful, sounds like bionx have made this part unmaintainable. I really hate having to replace perfectly working parts.

Bionx freehub crumbled away.

invert82

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