After Market Tire Pressure
08-02-2018, 10:47 PM
#1
Senior Member
Thread Starter
After Market Tire Pressure
All,
So I have the 35x12.5R18 NITTO Trail grapplers on my truck.
Stock door jam says to run stock tires at 35psi.
How ow do I find what I should run these aftermarket tires at??? Side wall of tires say max Cold PSI is 65 which in my understanding is if I am ever towing anything they need to be at minimum 65?
Can someone shed shed some light on this? Anyone have experience on doing this? Or is there a magic number?
So I have the 35x12.5R18 NITTO Trail grapplers on my truck.
Stock door jam says to run stock tires at 35psi.
How ow do I find what I should run these aftermarket tires at??? Side wall of tires say max Cold PSI is 65 which in my understanding is if I am ever towing anything they need to be at minimum 65?
Can someone shed shed some light on this? Anyone have experience on doing this? Or is there a magic number?
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Drewter52 (08-03-2018)
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Drewter52 (08-03-2018)
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Drewter52 (08-03-2018)
08-03-2018, 09:22 AM
#5
Senior Member
I have 296-70-18s in the Toyo AT2 Xtreme (10 ply) and run them a hair under 45 psi. You can't go by the door sticker when running larger, heavier tires. I suggest trying a few different pressures to see what you like the best. IMHO I wouldn't go under 40 psi, though.
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Drewter52 (08-03-2018)
08-03-2018, 10:09 AM
#6
Senior Member
Thread Starter
I've read several posts of people running 25-30, and even almost 15 PSI in these tires.
I am so damn confused!
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08-03-2018, 10:33 AM
#8
Senior Member
It took me some trial and error.
I had Cooper LTZ 18” tires on my ‘09 FX4 4WD crew cab - pretty heavy truck. The Cooper tires were LT load range E.
I ended up running 42# most of the time - would up them to 48-50 if pulling a trailer (~5000#). It took some time to get to that 42# - a lot of it feel on the road and also watching the tread wear. I measured the tread on the center and edges ever 1000 miles or so to keep track.
So...there is really no one right answer. Our trucks are different weights. Also our roads and driving habits are all different. I live in a very rural area where the paved state roads are terrible - all cracked up and heavy crowns in the wrong direction along with sharp bends on a 55mph road. Even if I ran 45# I couldn’t stand the ride on these roads.
I had Cooper LTZ 18” tires on my ‘09 FX4 4WD crew cab - pretty heavy truck. The Cooper tires were LT load range E.
I ended up running 42# most of the time - would up them to 48-50 if pulling a trailer (~5000#). It took some time to get to that 42# - a lot of it feel on the road and also watching the tread wear. I measured the tread on the center and edges ever 1000 miles or so to keep track.
So...there is really no one right answer. Our trucks are different weights. Also our roads and driving habits are all different. I live in a very rural area where the paved state roads are terrible - all cracked up and heavy crowns in the wrong direction along with sharp bends on a 55mph road. Even if I ran 45# I couldn’t stand the ride on these roads.
08-03-2018, 10:51 AM
#9
Senior Member
Thread Starter
Ok... think I got to the bottom of this... forgot to mention when I had these installed, the tire shop put them at 55PSI and I've bouncing around like crazy./.. 
Just got off the phone with my guy at Les Schwab (whom I should've gotten the tires installed at), and he told me there is no reason for a half ton to ever really run over 50 PSI for ANYTHING that it might be towing or hauling.
Ha has advised to put them between 35 and 40 PSI... 38 it is!
Just got off the phone with my guy at Les Schwab (whom I should've gotten the tires installed at), and he told me there is no reason for a half ton to ever really run over 50 PSI for ANYTHING that it might be towing or hauling.
Ha has advised to put them between 35 and 40 PSI... 38 it is!