i have a 5in on my 450smr and i personally think its too wide. i have a 160 conti road attack on there and i have clearance issues. only problem is that when i get a smaller wheel (4.25) the 160 will ride different. my ducati has a 4.5 and i use the same exact tire on the ktm and the ktm tire looks to have a better profile, where the duc looks like its too narrow. when i was using the stock 170 slick, the chain would hit the wheel really bad, and chewed up the whole way around, but with the 160 conti i have no issues with it hitting the wheel but i do have a nice little "X" pattern all the way around the tire.