My bike came with 140-90-15 which i just assumed was stock. but I always had rubbing on the edges of the tire with the fender because im a heavier guy and especially two up riding. Then when I came to bob it with the blue collar bobbers kit, the tutorial kept saying make sure you're using the STOCK TIRE for proper rear fender fitment. When I came to install the fender, it just wasn't fitting, that's when i realised that the tire on there isn't stock! had to grab a stock sized tire which also helped lower the bike.