In theory turbo question.

[Milzy]

say you have an 11 speed cassette on your smart trainer & you dropped a cheaper 7,8, or 9 speed bike on, it should change to only the sprockets the bike can reach but still be functional?

 

[Racing roadkill]

No.

 

[fossyant]

NO. Especially if indexed, spacing is different - they occupy about the same space, but narrower gaps. The chain may/will fowl the 11 speed cassette

 

[Milzy]

If you changed the chain you may blag it though. I’m sure this has been done.

 

[OnTheRopes]

If you blag it then the chain probably wouldnt centralise on the sprocket and you would have rattle and hence wear on your cassette?

 

[CXRAndy]

Takes a few mins to swap a cass on a wheel or turbo. Don't mix and match non compatible systems

 

[OnTheRopes]

Takes a few mins to swap a cass on a wheel or turbo. Don't mix and match non compatible systems

I'm not sure you can just stick an 11 speed cassette on a 9 speed wheel can you?