i have an 05 sportsman 500 with what i assume are stock tires that are pretty much done for so ive been looking on craigslist for some decent takeoffs. wheeler is at my parents house and cant recall what size tires i need off the top of my head and came across and add for all for tires for $100, AMS Black Widow 2-25x10x12 and 2-25x8x12.....will they fit????

 

Yes those will fit just fine. The sportsman came with two sizes 25" tall or the 26" on 12" rims. Either will fit.