Curious what you run your tire pressure at and why you went with that pressure? Also let me know if you were running 16" or 17".

When I put the 18"s on, they already were running at 35 psi and I just left it there. The stock 16"s were supposed to be @ 30.

 

I run my 18"s at 32 in the winter for better traction, and that's what GM recomends.
In the summer, I run them at 35 for better milage. I tried 37 for a while, but the road noise vibration was very harsh. I think that in GA you should be fine running the 35 year round.

 

Chalk'em or run'em over wet newspaper. Did it years and years ago when bias ply tires were almost all there was. The chalk wear/ rub mark or the tread pattern (left on the paper) that's pressed into the paper might tell ya something.

 

Yea, I did that with tires that had a sidewall..... But those 40 series don't flex too much....

 

but i would like to go larger. i truly believe i will get better mpg on the hwy. i am keeping 39 in mine now and i have gotten better mileage. i let a little out when it snowed. here is something to think about when running lower pressure in the rain - at lower pressure the tire will have a "cup" in the center. it will be harder for the water to escape. at higher pressure it will force the water out from the center of the tire.

 

I went from 16s to 18s. Running them at 35psi. Mine are a little oversized though.

 

solman, if it helps, my 235/40-18 Kuhmo ASX's on 8" rims have been run at 37F/35R. I'm at about 28,000 mi. now and should go about 5K more before needing replacment. The wear is perfectly even across the tread.

 

IF the tire says 44 max I run them at 36 to 38. That will give you good tire wear and gas mileage. But if it snows I would drop them to 32. Just my two cents.

 

35 to 36 psi all year round.

 

32-36 is fine for most but I would not go under 32 due to the short side walls and damage a pot hole could do.

If the tire wears more on the edge increase the pressure if if wears in the center decrease. Adjust them accordingly base on your abservations.

Note in most FWD a little more pressure is best in the front vs the back due to the extra weight in the front unless you are carring hewavy loads.

No one pressure is right for all as we all carry different loads, different driving styles and often have different tires that can make tires wear differently.

Best to read your tires as it is the best indicator of your needs.