Both of the rear tires 275/40 pilot sports A/S wear out alot in the middle with 32 psi setting. Should I lower the pressure even more to 30 psi? thx for help.

 

you need to add more air.

 

it could be the width of the wheels that's causing the problem. At 275 you'd want to be running something around a 9.5" width. I know many have put 275's on much smaller widths but it can create a bulge in the middle of the tire leading to premature wear.

 

Have your toe-in checked on the rears. Any more than .08" (2MM) and it will do that. Trust me. I moved pressure up and down and went through four sets of rears before an independent (read: NOT Nissan) shop took a true measurement of my rear toe-in.

 

Center premature wear out is caused by tire mounted on to narrow of rim or overinflation, PERIOD!!
Burning off alot will cause a little more wear in the center but not too much.
Toe-in and camber issues will show up as edge wear.

 

Wrong. I had three sets of 245/45/18s on the stock rims. Changed pressures constantly and NOTHING changed. It was the toe-in on the rear which the dealer erroneously set to 19MM because their fancy Hunter said it was 2MM. Severe toe-in on rears DOES NOT show as edge wear like toe-out does on the fronts.

 

Me and a friend of mines mom had the same problem I lowered my psi but his mom had to get new tires we realized to late.

 

The wheels I have are Privat Fahren 18x8 and 18x9. I know alot of ppl have this wheels for their z so that rules out the small wheels problem.

 

My toe-in has always been in spec, and both sets of rear tires I've owned have prematurely worn in the center. I've always attributed this to overinflation, but even after I've lowered the psi, I haven't noticed a major change in the wear patterns. :shrug: That being said, I can say that the rear tires will heat up about 2psi hotter when up to temp than the front tires, so I normally keep my rear tires 2psi lower than the fronts while cold.

1st set of rear tires: 37psi cold, lasted less than a year
2nd set of rear tires: 31-32psi cold, better wear, but still wears the center out since at the track the tires will get up to about 42psi.

 

I just notice today that one rear tires worn out more than the other in the middle and also it worn out unevently. Some middle spot are pretty much have nothing left, some still have a little, what could cause this? I dont do burn out just turn corner fast sometime.

 

I just noticed my rear tires are wearing on the inside more than the outside? What can I do about that?

 

could be to much negative camber. i had the same problem on my 300tt. mine was bad. check you alignment.

 

rears are in faethering the two posts above sound like there in on some FREE new tires . see other rears that got free rears in feathering post.

 

I gotta swap my stock wheels on for the alignment but I've been looking at alot of Z's lately and all of the ones with 19's that have been on a while are wearing more on the inside. I understand about the camber but if I take it out I'll be losing handling.