In 2011, I bought a cheap bike from Walmart. It's done fine by me on the ride or two I take per year, but I'm looking to enhance my home gym a bit and was looking to grab a direct drive trainer. The big thing here is I'm more concerned with being able to work out at home than I am with having a nice bike, and I'm looking to avoid the mounting costs of getting both a trainer and a bike.
The direct drive trainer I have my eye on has says it supports 9 / 10 / 11 speed cassettes - my bike only has 7 speeds on the rear wheel. I was planning on buying a 7 speed cassette and just using spacers, but the LBS said that I might have issues with a freewheel vs freehub if the bike was that old and cheap. Turns out he was right - I have a freewheel on the bike.
So here's my question - with a direct drive trainer, does it matter what the rear wheel has? I'm taking it off - my thinking was that as long as I get a 7 speed freehub cassette with spacing the same as my current setup, it should be fine.
Is that correct?