I have an 11spd 11-30 cassette both in my bike and in my direct bike trainer. My girlfriend recently purchased a road bike with an 8spd 11-34 cassette. What are our options for sharing the trainer? Our bike sizes are fairly different (54cm vs 44cm).
(I guess this is "easy" but not sure if practical): Swap the trainer cassettes every time: I put on the 11spd and use it, she takes it off and puts the 8spd cassette before using the trainer.
Keep the 8spd on the trainer. Will the 11spd bike work with the 8spd trainer? Maybe in ERG mode with no shifting?
What other options would you recommend?