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There are tabs on the inside of of the cassette catching on the trainer? I have a similar problem with 12s campag and my tacx neo
https://forum.cyclingtips.com/t/problems-with-12-speed-campag-on-elite-direto/3752/10
timmah!
Odd one this.
I have 12 speed Chorus on a Helium SLA (rim brake) that was built up in fits and starts over the last 6 months. I'd like to use it on the turbo (and Elite Direto II), so I bought a Campag freehub for the Direto.
When the cassette is installed on the turbo, it spins backwards/freewheels perfectly. But when i put the bike on and do up the QR, the cassette locks - it won't spin in either direction. I am certain I've installed the freehub correctly, and the cassette is torqued onto the freehub properly.
To check I wasn't being a numpty, I even tried an 11sp 105 cassette (with the existing Shimano freehub). And while the shifting was predictably shit (11sp Shimano and 12sp Campag unsurprisingly not playing well with each other), the cassette/freewheel spins perfectly.
I would add this problem is unique to the Campag 12sp on the trainer. No problems on the road. I'm baffled, and Elite customer service haven't replied. Any tips gratefully received.