jeffieh

Greetings from the South Pacific! I write today with a minor-ish but annoying problem that's happening with my TSDZ2 mid-drive. Sometimes (and it's usually just after changing up) the cranks spin freely instead of engaging with the motor gear. It's a completely 'clean' spin - no hint of the shaft partly engaging or rubbing or anything like that. I wondered if it could be the sprag clutch but I can't see how this would totally fail occasionally and yet work perfectly most of the time. Has anyone had this experience, and if so did you get to the bottom of it?
Any feedback will be gratefully received.
Many thanks, Jeff

TSDZ2 48v, 500w with 6100km on the clock.

2old

Not much on the "TS" here; you might check endless sphere.

randomgear

Nothing is failing, the mid-drive needs to have a freewheel in order to have the pedals remain in place while the chainring spins and provides power. The same situation occurs on my mid-drive Bafang 750w, when I hate it is when I stop and find no resistance on the pedals, but it;s an issue with the mid-drive system.

Doc_Wui

I cannot see it being normal on any middrive, because if the pedals spin freely forward, you could get injured badly. For example, if you stand on the pedals while climbing a hill, they better not let go,

2old

It's never occurred with any of my three BBS02's.