Originally Posted by veganbikes

You could purchase a 7 speed cassette to work but I gotta wonder what kind of bike she is running? 7 speed freewheels are long out of date so it is either something cool and vintage or she could use something a little nicer not from Aisle 10 at WallyMart and you could get a cheaper trainer. Either way check and make sure the spacing will work on that as it is possible the bike could still be 126 spaced (not likely in 7 speed but you never know)