will these fit on stock rims

go with the 20" 6 ply, thats the best because you said you didnt know if you would be allowed to race or not, you can do select from these sizes that will fit for the stock rim, and you can still race with 20"

18x10x8
18x11x8
20x11x8
20x10x8
22x10x8
22x11x8

those are your tires choices, if you have questions just PM me, and go to to motosport.com they have better prices and better service, thats where i order all my parts and ive never had a problem with them I:I
 
mx track only(no rocks or roots) = 18's
all around/trail tire = 20's
 
wow old thread......but you can use the yfz fronts no problem, but the rear you need the hubs from either a banshee/raptor/warrior