Nitto 555R air pressure for street driving?

golkhl

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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.
 
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golkhl

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

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28-30# sounds right to me.
 

Norm Peterson

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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

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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

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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:

20170317_18s.jpg



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, :)


.
 

Norm Peterson

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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

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

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