hello dabster the bike has had some mods done these were done when i bought the bike. alls i can tell is its a DID wheel. am gessing its off a jap bike witch 1 i have no idea. and the S/Arm has been brought Forward and extended at the rear looks like its been done proper. it dose turn pritty tight not sure about the headstock dosant look like its been changed. the headsteady also has been moded to. looks to be verry strong and neat. the engin has been rebuilt to all the crank case nuts look new. i need the forks rechroming witch i plant to do soon i have some new moden seals to go in. rides supberb tho since piuting the new mikuni on