so it comes with a 17" wheel. the triple tree appeared to me that it could travel up and down the fork arms, in fact one side slipped down a bit on me when i was installing it, so I think its defiantly possible.
As I said b4 these are a great buy at $155. They are alot beefier than any stock moped shit, but still look appropriately sized for mopeds and should fit on to most bike with very little modification.
Personally I'm not a big fan of the disk brake, its stopping power is to far over the limits of the moped frame for my tastes. excellently tuned up drums are good enough (and stop quite good) as long as u have some forks like these to support them.