So I finally made the switch from a 250f to a 450 and i love it, but the knobbies on my Bridgestone M404 rear tire are chipping like crazy. I'm used to riding 250f's and I never had this problem. Do most 450s chip the knobbies off tires, or do the Bridgestone M404s just suck? They get awesome traction they just arent holding up very well. Anyone else have the same experience?