What PSI?

I just got a new Toyota Tundra. The dealer put on coil overs and bigger tires - Toyo A/T 295/70R18
When I got home I noticed the tire pressures varied from 39 to 48. When I looked up that tire on the Toyo website, it said the maximum pressure was 80 PSI. When I went to Discount Tire for a tire check, the guy said he couldn’t go any higher than 38.
What’s a good pressure for daily driving?

 

I have the same exact size tires but mine are Nitto Ridge Grapples and got them at Discount, they always air them to 38 as well, no problems here for street!

 

Easy way to find the correct pressure for bigger tires is to make a chalk mark across the tire tread and drive in a straight line for a little bit. If it is gone the pressure is right. Have some left in the center, pressure is low. Have some on the outer edges the pressure is to high. Tire pressure will vary based on type of tire (i.e. LT vs. non-LT and sidewall construction).

 

X2 for chalk test, it varies by tire

 

ive never heard that, great tip

 

Bump the pressure up higher than you think it should be and perform the chalk test. Slowly let air out of the tires and keep retesting until you get it to where there is almost no chalk on the outer edge.

 

Did that a lot in my old hot rod days. That method been around probably longer then I been alive.

 

Call Toyo they will give you a recommendation, then do the chalk test starting at the recommended pressure and adjust up or down as suggested. Toyo's suggestion will be pretty close and their customer service is good for that kind of info.

 

Been interested to find out this info as well. I have 275:70:18 Cooper ST Maxx with same rating. Toyota was putting them at 36 psi for the longest time until I decided to play with it myself recently. Put the fronts on 45 and the back on 40. My average MPG almost went up a whole mpg since then but the ride is a little stiffer compared to when they were at 36. Wondering what the sweet spot is with this size.