George F. Webster

I'm leaving tomorrow from Milwaukee & driving to Florida - all high speed xpressway miles.
In the addendum to the owner's manual Audi sent out, they suggest adding 5 psi to normally recommended 33F/30R cold pressures for this type of driving - this run's counter to my understanding of what hi speed xpresway miles do to tire pressures - won't I end up running with pressures up in the 40's after a couple of hundred miles?? and apart from the attack on my hemarroids - is this what is intended??

Thanks for any input you can offer.

krunch

Whenever I make the Boston-NYC trip to visit my brother, I always seem to lose 2-3psi by the time I get back home.

-Krunch

juliem

The longer/faster you drive, the more heat - the tire 'bends' more where it contacts the road (sorry, lameish explanation). Anyway, if the tire is stiffer it stays rounder and generates less heat than if it was too soft. Over inflated is bad too.

If you add weight to the car, you add air to compensate. Same if you were going to track the car, stiffer tires have less side wall rollover and flex.

Ok, now all the bad boys can make stiff and soft jokes for friday!

krunch

What would be considered overinflation for street driving. I understand the need for high pressures (in the 40psi range)during track/autocross events, but how is normal (or long distance) driving affected. I tried 39R/36F and that seemed a little too much. I'm now running 38F/35.5R and it feels better. Besides the tire's succeptibility to damage (cuts, punctures etc) what else goes on with too much air?

Thanks,
-Krunch

BillK

Pressures listed are meant to be "cold" pressures, increase with warmth already accounted for...

juliem

excessive wear in the center of the tread - and heat build up too