Got looking at my front tire and found the wear indicators were level (OEM D250). Was thinking of buying a Avon Cobra and mounting it myself with dyna beads for balance. For future reference has anyone replace the valve stems with just the short straight black ones like on autos, I would think they would work OK. I can not figure out why the front is gone and the back still has lots of tire left, did I miss the wear indicator on the back one? Is there anything else I should be looking at as well?