Nitto 555R air pressure for street driving?

[golkhl]

305/40/18 Nitto 555R drag radials on a 9.5" wide rim, what psi should I be running on the street? Only got 2yrs and about 5k miles on my last set, 285/40/18 running 30 psi on the street.

 

[golkhl]

Pic of new tire. Sorry for the sideways pic, cant figure out how to fix it!

 

[stkjock]

28-30# sounds right to me.

 

[Norm Peterson]

Separate from the whole idea of driving around on DR's . . . keep a close eye - with a tread depth gauge - on center tread wear. Even at 28 psi I'm betting that the center ribs will wear a good bit faster than the outermost ribs.


Norm

 

[46addict]

I agree with Norm. When looking at the tires after driving over sand, I got a clear picture of the contact patch. The 245/50/16s I had at the time mounted on 16x7 V6 wheels did not appear to make full contact any higher than 20psi. You are giving up a ton of load capacity by lowering air pressure but there is plenty of wiggle room with a 97# load index and higher.

 

[Gabe]

I've run about 28psi on my 305/40/18 555R's on the 18x9.5 rims, and after a couple years .... it's the one on the left:

The one on the right is the fiancee's.
Same exact tire/size, on same size wheels.
Just a much heavier foot working with the one on the left,


.

 

[golkhl]

Thank you for the feedback, going to try 28 psi.

 

[Norm Peterson]

27 or perhaps 26 would be a little better for evenness of wear (as long as it doesn't get too "woozy-feeling" in the corners or at high speed). A 305/40-18 SL tire still has more load capacity at 26 than the non-GT500 OE tire sizes do at 32 . . .


Norm

 

[golkhl]

Thanks Norm, I will try 28/27/26 psi and see what works best for my car. Thanks again all.