I had to buy a ludicrously expensive adaptor from Tacx to fit my bike on to my turbo. Then it didn't fit properly and I had to get an extra spacer bit (which, for reasons I don't quite understand, isn't included as standard with said overpriced adaptor
). I'm still not convinced it's properly fitted and so haven't tried it out yet...this is a direct drive one though, so hopefully wheel-on turbos are more straightforward!