The stock MX51 tires on the '14 450 are all done. 300 miles. They have to be one of the worst tires ive ever used. What kind of tires are you guys using? Ive been looking at the IRC M5b as well as the Maxxis Si. The IRC is available in a huge 140 width, will that clear on our bikes? I know this is a very opinion based subject so lets hear them. Thanks in advance!