HYK123

yeah,
But $400 every 3,000 miles suxs. My next set will be pirellis. about 290 for 2 rear tires. If i get 5,000 i'll be happy. In summer I use my 928 as a daily driver. So 3,000 miles comes by pretty fast. The goodyeat tire guy loves me when I come in. Does it matter if u mix and match front and rear tires with different brands?

nee.dragger

13.86 1/4 e.t. . . . . have you done any mods to the car? Sure sounds quick for an 85 928 with a 5 speed.

Fogey1

Malcolm wrote:
"Michelin Pilot Sports all around stock dimensions from the PO 5 years ago. Replaced the rears with same and they lasted perhaps 15k kms at Porsche pressures. New set of rears at GTS settings with 7.5k kms of wear seem like new.............I'm of the opinion that we can put the latest rubber on our cars and decrease pressure accordingly thus gaining relative good life time from sports tyres on an excellent GT car.........YMMV"

I was under the impression that inflation pressure affected the pattern of tire wear, i.e. wear in center or wear on edges, but I'm not sure how it could affect the rate of tire wear (assuming no burn-outs, screaming corners, etc.) Help me out here, please.

the flyin' scotsman

Will.............when I roadraced motorcycles we were always looking for a certain % gain in pressure from cold to hot. If you got it right OK otherwise you decreased or increased accordingly. Street driving is easilly defined as to much pressure and you'll wear the centre more; under inflation you'll wear the edges. As said in my previous post the Porsche pressures were good for the tyres of the day at full speed and full load. Depending on your car load and driving ability you may want to completely ignore everything and revert back to the 10% guage ..........cold to hot pressure delta!!! If your not on the race track you may never see the 10% rise unless your doing extreme speeds on your local roads............remember these tyres are for all street conditions, rain and dry!

Glen McCartney

I put a set of Bridgestone SO3's on the car last spring and am getting ready for a DE and measured the tread depth, on the rears center of the tire was just a hair over 3/32, while the outsides were between 4/32 and 5/32. They were inflated to 36psi and only one DE event last year and 12K miles on them. The fronts are wearing much better, between 5/32 and 6/32, even all the way across. And I don't have a supercharger!!! I think I might switch over to the Michelin Pilot Sport 2's, sounds like they are lasting longer. Probably lower the rear pressure to 32-34 psi to see if the will wear more evenly. I will probably have to change all 4 even though the fronts are fine, the region requires all 4 tires to be of the same brand for their DE event (min tread depth for tech is 3/32 and I have 2 months before DE). Hate putting on brand new tires to run in a DE.

Glen McCartney

Forgot to mentiion, they are 225/45-17 on fronts and 255/40-17 on rears.

fabric

Why exactly would tires of today require different pressure? I see a recommendation for lower pressure, are the sidewalls more flexible, so that you can run lower pressure but still get even treadwear?