hey i keep popping my frikin tubes. i think i'm pinching them. i'm running maxxis maxx daddys, 1.85 front, 1.75 rear, both rated at 35 psi 8O i think thats pretty low. its recomended for 35, and i put it at that, and they pop by bunnyhopping off of curbs! god damit. ANY HELP?!?!