I run mine at 35 psi. I would go much higher than that.

 

I run 35 on mine also, even though I have 20" wheels.

 

In terms of load capacity, your rear tires are the same as the 235/50-18, so I'd treat them like 235/50's in terms of inflation pressure. 32 is the door sticker pressure for those; where you go from there is up to you. I would suggest keeping an eye on the evenness of trearwear. If you rarely have back seat passengers or heavy trunk loads, 30 is probably adequate here (and you may find that it helps the rear be better-behaved).

Your front tires are a couple of load index numbers smaller than 235/50-18, so you need about 3 psi more to maintain the same load capacity.

As I understand it, tire load capacity is related to how much it deflects/distorts in service, which is related to heat buildup.

Try starting with 35 front, 32 rear with that combination and tune from there. For a little less understeer as long as you're lightly loaded, 36/30.


Norm

 

thanks for the help guys ill let you know what i do

 

A good rule of thumb is between 35 to 40 psi if your running low profile tires. I run mine at 40psi for 3 reasons, 1. Pot hole rim protection. (hit a unforseen pot hole at high speed with an under presure tire and your going to do damage to the wheel or worse have a blow out) 2. Max MPG, (low presure tire means less MPG) And 3. Tire wear, (low presure makes more friction and causes your tires to wear out faster). On 40 psi in my 265x35 20's the ride quaity is still good

 

i put in 35psi see what happend maybe ill go 40 psi sound better to me

 

This is old-school thinking. Today's tires not only have sophisticated design when it comes to tread pattern, but they also have sophisticated design when it comes to tread compound. The tread compound is often quite different on the edges of the tires than it is at the center. You are usually better off by using the same tire pressure in all seasons.

 

40 is too much IMHO, your ride quality will suffer as well as your traction


IMHO - Listen to Norm - 32psi

 

i got 35 in now feels good so ill leave it for now