Will 26-9-12, and 26-12-12 mud lights fit on stock 05 sportsman wheels with out rubbing, and does any one know the stock rim sizes

 

i just got stock tire sizes for my '99 sportsman(25x8x12 front, 25x10x12 rear) and for some reason the front tires went on fine with stock rims, but the rear rims were way to small for the tires. why? i have no idea, i have to get new rear rims. but anyway it should say the rim size on your rim, but if it could of wore off or something. my guess would be no they wont, but like i said im just guessing im really not sure.