I've been measuring everything on the back end of my 03 FXST and come up with the following regarding installing a bigger rim/tyre. I can get a 200 tyre on a 5.5" rim and stock swing arm but switching to chain drive with offset sprockets & maybe have to machine my caliper a bit. I can go up to 250 on an 8.5" rim and wider swing arm & use my stock belt but according to my measurements I'll have to fit an extended mainshaft & space the primary out 1 inch - OR I can spend lots of cash on the 07 swing arm, narrow pulleys & belt and use a 200. It's down to belt vs chain final drive & also any opinions on how severeley the 1 inch primary spacer throws out the handling??