Complete Newbie here (which will probably be evident by the following question):
I just bought a Saris H3 Direct Drive smart trainer. It says I need an 8, 9, 10, or 11 cassette. My intention is to only use the indoor trainer with the bike I’m purchasing for it. Let’s say I have an 11 cassette on my trainer, can I use a 7 speed bike with it? Would making any modifications make it possible (i.e. 11 speed chain)? I guess my simple mind was thinking if I took off the back tire, I could just attach the frame to whatever cassette I choose, I just wouldn’t be able to use all 11 gears if I had a 7 speed bike? Thanks for any help you can give me!