Spare wheel for indoor trainer use Just discovered this very useful site, now for my 1st question.

I have a nice carbon bike with ultegra 6800 11 speed  (11-32 cassette)
I wish to use this bike on an indoor trainer (on Zwift) but wish to minimise wear.
I planned to get a spare rear wheel (Shimano RS010) 11 speed hub and fit a trainer tyre.
To save money I would fit a 105  5800 (11 speed) cassette on the RS010.

Obviously then just change rear wheel depending on road or trainer.

Ques: Do I need to stay with a 11-32 cassette or will I degrade gear changes by fitting
maybe a 11-28 ?

Will I degrade gear changes by using the 105 cassette in place of the ultegra one ?

There is minimal wear on the existing components so mixing new &amp; used hopefully will be ok ?

Advice and your thoughts appreciated.
You should be fine using a 105 cassette on the turbo wheel. There will be wear to the chain, cassette and chain rings, but provided the drive train is clean and lubricated then this should be minimal. Doing what you've suggested is a good solution. Try to make sure if you use the bike on the road then the drive train is reasonably clean before swapping onto the turbo wheel and if one cassette becomes more worn than the other then replace it, or you might then have problems and cause more wear on the chain.