Is that 34 psi COLD or HOT? If its COLD the "wear pattern" (whatever that means) may look even now but down the road you'll start finding the tread depth in the center is a lot less than the tread depth on the sides.

33 to35 all around.
4 years later and 4000 miles not a hint of wear.
This car is a pleasure car.
It's not a pleasure to my wife to hear I need new tires.
I think the ride is a little hard but cornering and off ramps at 40 mph blows back what little hair I have left.
Marshal

:iagree:

69 small block, just removed 265x50/15 tires that were 12 years old running 30 psi cold. No measurable difference in tread wear across any of the tires.

You have been working on cars for 60 years and have no idea what a "wear pattern" is? And here you are telling people to run their tires dangerously underinflated? Because you, and obviously NO ONE ELSE here has a tire wear problem and your cure was to let the air out?

In 15 years they come and go, just a matter of time......

I ran around 28psi cold in my PS2's from new and they lasted around 40k miles. The old owner ran 32psi cold in the PS's I took off and they were worn out in the center. That doesn't match with what Michelin told you would happen?

I can't see any reason to run 20psi cold in any car tire though.... :leaving:

34 PSI hot. I'm not even going to deign to comment on the rest.

So if my car is 2000 lbs, I can run at 9lbs?

Professor, I'm sorry, but your logic is gonna get somebody killed.

Tire patch is simple. Drive over some card board, and look at the pattern. Adjust accordingly within reason.

Running 225/15 with 32 psi. long life and good ride.

:iagree:

Seems we/re being forced to weather a barrage of such misinformation lately, which I do hope viewers who may be relying on the CF for genuine expertise are able to discern out.

Got any proof of this claim that pressure ratios with load from a reputable source such as a tire manufacturer?

Comparing a modern Michelin PS2 to a first generation Goodyear GT+4 All season ZR tire is not a fair comparison performance wise or for wear....Comparing a PS2 Michelin with 28 PSI versus 40 PSI on the same car, driven the same way, is the only true comparator for mileage wear. Different tires in the same size on the same car from different manufacturers will wear differently.

One key factor that I have not mentioned when running higher than "normal" pressures that is critical to maintain relative wear across the contact patch is you MUST rotate the tires more often a normal person would (which for most people is NEVER) if the tire is not uni-directional (which is not possible for uni directional tires...Only front to back, not side to side). Most tire techs will tell you that under normal pressure that they rotate their tires every 5,000 miles for max even wear. If I can rotate tires on my cars, I generally do it every 8-10,000 miles.

I've seen complaints in the C5 forums about PS2's wearing out in the center first when using the recommended pressure on the car's label. I've also seen posts claiming Michelin says to run higher pressures. But I'll keep with the slightly lower pressure since I got around 40k miles on a tire that is only treadwear warrantied for 10k miles.

The tire manufacturers only make the tires and the amount of pressure needed is dependent on what kind of load the tire is carrying. If you put it on a wheelbarrow 5 psi would be more than enough.

Right after I bought my '82 in 1988 I noticed my tires would wear the centers out very quickly when 30 psi (COLD) was used. I dropped the pressures on my new tires down to 25 psi (COLD) and that helped but the centers still wore out. On the next set of tires I tried 20 psi (COLD) and they wore perfectly even so I have stuck with 20 psi (COLD) ever since.

Remember, when a tire is run at freeway speeds the pressure increases 4-5 psi so on a freeway my tires will actually have around 25 psi of pressure which is more than enough for the small load they are carrying.

I don't think 5 psi in a wheelbarrow is enough, even at sustained highway speeds. But next time I decide to drive my wheelbarrow down the interstate I'll check it out.

:rofl:
I see that I am not the only one:lol:

I never add or subtract air from my tires. I'm a purist and I don't want to mess up the date code on my 1975 air. No, Really-----I take my age and divide it by two and then deduct 1.5 pounds. No, wait----I run 32 all around (except the spare which is usually flat if I need it).
Sorry I'm such a wiseass!

Whatever you say.... But 255 series tires wearing the centers out unless you run 20psi? That is some serious hogwash. I'm running 30psi cold in a 275 series tire and 28psi cold in a 305 series tire and they are not wearing in the center, AT ALL, NOT ONE BIT. My car should be lighter than yours too.