My wife has a 2017 Specialized Alibi Step Through. Specs can be found here: https://www.specialized.com/us/en/alibi-step-through/p/154232?color=&searchText=B6617-7402
I have recently ordered a Tacx direct drive trainer. While I should have no problem getting my own bike with a 11-speed cassette on the trainer, I believe my wife's bike will have problems. I'm trying to find the cheapest solution to get her bike on.
I've read the following related posts: https://www.reddit.com/r/Zwift/comments/fgap31/7_speed_cassette_on_a_direct_drive_trainer/
But I still have doubts. First of all, from these posts it sounds like I just need to get a 7-speed cassette with some spacers to fit a 9/10/11 speed compatible trainer. But as my wife's bike has a FREEWHEEL, the hub should not accept a cassette. Please correct me if I'm wrong here.
Also, let's say a cassette and some spacers were really all I needed, and I have my bike shop to adjust the shifting/derailleurs for me to get the bike on a trainer. Do I need to adjust the shifting/derailleurs again if my wife wants to ride outdoors?