I'm not sure what wheel size ou run, but from what I can gather, the lower the profiile the higher the pressure you need to run. I would expect the higher the weight the higher the pressure also.Quote:
Originally Posted by newby@54
On my Audi when it was on 19's it wore the front tyres on both edges really badly despite being at the recommended pressure, and with the cost of 255/40-21 Pirellis now I did a bit of research to stop this from happening. The recommendation from people who run the same tyre/car was that they needed to be at 42psi for them to wear properly. I also chatted to the tyre mechanic who checked the wheel alignment and he recommended 40psi (and said 42psi was even better). He was saying that the lower profile tyres generate a lot of force through the sidewalls (edges) and as you corner it rolls the corners down and it unloads the middle of the tyre which makes them wear on both sides and the increase in pressure is to make the tyre retain its shape (and retain traction) when cornering. My D2 on 285/75-16 with its big sidewalls wear perfectly flat irrespective of if I run 32 or 42psi but has lost a bit of traction at the recommended 28psi.
