Proper Tire Pressure for 265/70/17

[VegasRanger]

So my truck originally came with 265/65/18's from the factory. Recommended pressure is 30 psi according to Ford.

I switched to the 17" sport rims, and went with 265/70/17 Wildpeaks. Discount Tire set pressure to 35 psi.

I also switched to eibach front and rear.

The combo of eibach rears, and the wildpeaks + 35 psi, the ride has been pretty darn bumpy. I lowered the psi to 31 psi and it feels a lot better, but the tires visually look "low."

Is it OK to keep these tires at 30 or 31 psi? I kept the front at 35 because if I lowered them to 30 psi, they look low, they have a bulge.

Wanted your thoughts on this guys.

Thank you!

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[Trigganometry]

Best way to tell is chalk line them and drive a bit. Look at how it wears off. If even all the way across you’re good. If not adjust accordingly. My guess is you’re pretty close already

 

[rang19ca]

My stock tires call for 30 and they look a little low, bulge on the side. I keep them at 30-31 and the wear seems even across the tread at 9300 miles.

 

[Goldenlunaofogden]

I keep mine black out package with Wildpeaks at 32 cold.

 

[2.7EcoBoost]

What is the load rating? An LT rated C,D or especially E is gonna ride harsher than a SL or XL. I have Standard Load Grabber ATx in the size you mentioned. I set them at 33 psi and with Bilstien's it rides perfect.

 

[VegasRanger]

What is the load rating? An LT rated C,D or especially E is gonna ride a harsher than a SL or XL. I have Standard Load Grabber ATx in the size you mentioned. I set them at 33 psi and with Bilstien's it rode perfect.

These are P rated.

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