additude

I am getting ready to put new tires on my car and have an observation with my old tires. I have tread in the middle of the tires, but lost tread on the outsides (inside and out). I have watched this happening over the last 2 years that I've had the tires.

The tires I have are custom wheels 255/45/ZR17 which is not the factory stock size. These are wider and lower profile and 1" bigger.

I have rotated my tires at least half a dozen times, I uaually try to do it in the spring and in the fall. I am religious about tire pressure. I have an air compressor and a portable tank so I check and do it frequently.

I maintain cold air pressure at the manufacturers recommendation, which is also what Lexus says my car should be.

It looks like my tires have been running under-inflated, more wear on the sides and not in the center. I use two different pressure gauges, so it's not a faulty gauge.

So my question is pretty much should I be running more air pressure in the tires because of their increased width vs my car weight?

I actually had my wheels off yesterday when I was working on my brakes and if I looked flat across the tread, with the wheel just standing there and no weight on it, it appeared to be a little concave at the center.

Any thoughts, ideas?

Thanks,

Wes

rominl

iTrader: (4)

is your car lowered? just wondering. i would run higher pressure like 35psi or so and see. maybe 32 is too low

additude

It's not lowered.

I put 36 in today.

Is it common to need to run more psi in wider non stock tires?

Wes

rominl

iTrader: (4)

i don't know if it's common or not, but imho all tires and such are different. personally even on stock i run about 35psi