I have quite a bit of old freewheel gear, I was wondering whether if I build a wheel up on a freewheel hub, whether if I use an 8spd I can run 7 on it as well. I have some 7, and I think a Mountain bike on 8, parts seem a lot more available for 7. But the 8 would let me run a better freewheel for my purpose. I don't want to end up with an 8 and find if something goes wrong I am limited to the parts I can use, I would probably only run it if it was backwards compatible to the 7 stuff as well. Anyone remember?