Thanks for the info Teebs. The reason I need one is this: PSW Customs, the only group I have found to make a weld-on hardtail for the xs400, designed theirs to use the xs650 size wheel. The bike I'm hardtailing is a maxim, therefore it has the swept back 5 spoke wheels. I don't want to have to buy a front and rear wheel because I'm on a budget. Do you know if the xj650 and the xs650 have the same size wheel/axel? Again, thanks for the information