What pressure do you inflate your T1Rs to? I have stock size 225/40/19 and 245/40/19 Toyo T1Rs. I like them but it feels like they are under-inflated at 32. I can feel a short reaction delay between a flick of the steering wheel to the moment the car begins to change the direction. Also, the rear end seems to feel softer in turns.

I think that is famous softness of T1Rs sidewall, which contributes to the delay in response and mushy rear end. Would it make any significant difference if I run 36 in both fronts and rears?

 

35psi

 

+1 i have t1r's on stock 19's at 35psi

 

im running 245/35/19 fronts and 275/35/19 rears at 35psi.. but i feel that 35psi is still under-inflated.. maybe i should go up to 40psi? anyone think this is bad?

 

Mine feel best and wear more evenly at 38 cold.

 

For years the lab test psi for 44 max tires was 35.0 psi cold. Newer 50-51 psi max tires have no standard YET.

Generally 80% of max psi is a good place to start.

44 x0.8=~ 35 psi cold
51 x0.8=~ 41 psi cold

Really depends on the number of pound inch stiffness you want from the tire and the contact patch square area you want to create.

 

I've always ignored what it said on the tire and went by what it says on the door, which I think is 35psi cold. Not sure where I heard this rule but...its fine for me.

 

thats what I keep mine at, but when it gets below freezing I put more ar is cuz the tpms makes the warning light come on. I think the tire pressure drops when it gets cold out.

 

I think I have nitrogen in my tires. I will have to pay a visit back to the dealership where I had my Toyos put on just a week ago. I'll ask them to pump it up a little bit to 35-36psi.

 

Yeah, it happens to both of my cars (G35 and Xterra).

 

BTW, what is the definition of "cold"? Here in Texas on a sunny day you can get 100 degrees in a cold tire

 

it does...

 

Cold = air contracts
Warm = air expands

 

when the car has been sitting for more than 3 hours or has been driven less than 1 mile.
-GP-

 

This isn't a new question on Driver, the questions have been asked before!
Oh well, here goes 35 PSI cold means the tires haven't been run for a while.
Do not go by what it says on the sidewall of your tires, that's Maximum PSI.
You could run 40 PSI in your tires but I think that's too high, feels like your
driving on rock hard tires. I use 35 PSI in all my tires front and back on cold
Calif days. Going up two or three lbs would work better in colder climates,
or go by what it says to use on the door jam.