I have a 10-speed bike and my wife an 11-speed. I have burnt enough old tyres on my indoor trainer so decided to try a trainer specific tyre on an old wheel.
The old wheel currently has an 8-speed cassette on it. What would be the effect of using that with my bike and my wife's bike? I'm guessing this would be pretty horrible.
What if I change the wheel to a 10 speed cassette (which is what I will probably do) will my wife's bike work?
My current rear cassette is 11-23 if I put a bigger cassette on say 11-28 I expect my chain would normally need to be lengthened. If I don't lengthen my chain will I just lose the use of the largest cogs or would there be worse consequences?
I have no concerns about poor shifting or missing gears because it's only on the trainer. As long as I can get in one gear that's enough, the trainer has its own difficulty adjuster. Wear on the chain or damage to other parts would be a concern.