OK I know it's probably been covered before but not having much luck with the search. I just picked up a set of XR70 forks and lower clamp and want to mount it on an XR50 with a 12" wheel. What hub/spacer/brake is best to use. Any machining involved? I already know about the cable holder issue. Any disc brake setup work? Can you get a spoke set for an XR70 hub for a 12 " rim?? Thanks.