Hey I just put the Michelin PS2's on my stock 19's and I'm very happy with them. Discount tire in Kirkland, WA however chipped up my like-new rims and refuses to call me back after 3 weeks.

My question is, does anyone have a recommended tire pressure setting on these? I'm running them at about 33 psi right now for a softer ride but wondering if anyone else had a suggestion.

THanks!

 

check the sticker on the side of your door...my 03 sticker says to set it to 35 psi...you have to go by what the sticker tells you not by what the tire tells you...

 

These are not OEM tires. PSI rating on the side of the door is for the OEM set.

Different tires, different construction...sometimes equates to a different PSI for optimal performance. I want real-world suggestions.

If no one has suggestions on these specific tires on the '05 19", then I'll just play around with them until I find what I'm looking for.

Regardless, thanks for trying to help.

 

tire sizes?

 

Stock.

225/40-19
245/40-19

Thanks.

 

It should say right on the sidewall what the Max pressure is. I'm running Toyo - their max is 50 lbs, but I run at 42 for a bit softer feel.

 

I would say stick to the stock 35psi, or close to it. The air volume of the PS2's should roughly be the same becaues they are the same sizes as stock.

 

The air pressure in the tire is based on the load on tire. ie weight of the car on the tire. It doesn't matter what brand of tire it is.

 

Never use the sidewall rating....
It's max for safety reasons.

FWIW I think 42 is WAY to high;
You are likely wearing the center of the tire patch,
& tire will not be gripping properly.

 

A good rule of thumb is 80% of max rated psi for 44=35psi for 51=40-41psi.

In the tire testing lab most test graphs are created with 35 psi COLD inflation but Cold being 70F inside lab temperature and they rise to 40-41psi with zero camber on the test machine.

The reason for the 80% is that most manufacturers chose tire sizes that have a front weight load of 80% of max tire load.

A 95v tire is 1521 and usually used on a car which has a [1521 x 0.8] = 1215 pounds of static front tire load [4,000 pound cars]..........this reserves the extra load for braking where the 3-4 second braking time is managable by the tire.
Engineers assume that FULL braking is an ocassional event and that those that road race drive near limit for any amount of time know what they are doing and have purchased appropriate tires.

The tire placard psi is for the average driver who doesn't stress tires.

 

Wow, I'm surprised to find G35 folks so unclear about tires and tire pressure.

42psi is much too high for the PS2's. Every tire is usually different. For instance, I'm running my PS2's at the same PSI rating as I did my REO50As. The PS2's feel sloppier than the potenza's at this PSI.

I guess I'll figure it out myself unless someone who owns a G35 with 19" OEM wheels is running PS2's and can chime in on their current PSI setting and their thoughts on handling.

 

Why don't you try running on 35 psi for a week and increase it to 40 psi? If you plan on doing this, don't change your driving habits from one week to the next. Why do this? The overall ride changes from +2 psi or - 2 psi. You may like a stiff or soft ride. I don't know and only you do!! This is what I always do when I swap out the OEM tires. It's a pain in the rear but it's worth it. Plus, how hard is to increase or decrease the tire pressure to four tires? A trip to the gas station...it's not like you don't go to the gas station on a weekly basis anyways! Give it a shot!!

 

You should be good at 35 to 36 psi.

 

Just use 35psi like it says on the door. Regardless of tire, the psi is set to cushion the weight of your car distributed to the four tires. A bit lower is fine to soften the ride, but it also increases the chances for a bent rim if you hit a pothole. A higher psi will give you a stiffer ride, but may increase response, handling, etc.

I upsized from 18's to 19's and went down from 45 to 35 profile tires. The techs at the tire shop recommended using 37-38psi to compensate for the lower profile to cushion the rims and increase response on a wider set of tires.

 

So how are those PS2's treating you? I've had mine for about 12 weeks now and have kept the pressure at 32 without any problems. We've had a few tropical storms and some real hot weather so the tires have been run through the gamut. Haven't been disappointed with the purchase.