35x12.50 ProComp Xtreme AT's are on!

[TampaDieselFX4]

Had them put on yesterday. Kept my factory 20" wheels. the tires measure 33.5" tall on the truck... pretty much the same height as the OEM Goodyears; maybe a 1/2" difference or less. So far I like the tires a lot. Very quiet, deep treads, siping and E range. 40K warranty also

I actually kept the front mud flaps on, they don't even rub, it's close, but clear, couldn't believe it myself They also don't even come close the front bumper valance... miles away. Kinda sad, I don't need my 4" lift to run them even. Tires still look WAY to small for the truck on that lift. I'm guessing if I had 20x10 aftermarket wheels I'd need the lift. on the stock wheels, with no front mud flaps, and some trimming I bet I could EASILY clear 37's.

The shop set them to 55psi F&R. Today, I Used Whiteout and drove around the neighborhood and looked at the wear pattern. I dropped the rear down to 50psi and the pattern is much better, but not 100% perfect even wear. I didn't want to go under 50psi, but I'd like to try 50 in the front & 45 in the rear. I bet that would give it perfect wear. but does that PSI sound to low???

 

[Sawboy]

WorthLess

 

[Crumm]

I'd like to try 50 in the front & 45 in the rear. I bet that would give it perfect wear. but does that PSI sound to low???

I run as low as 35 in mine when empty. I think they are at about 45/40 right now. I have narrow wheels and wide rubber so low pressures are needed for even wear. The low pressure also makes for a smooth ride and better traction. When I load up the camper I air them up to 60/65 but there is no need for high pressure when running empty.

 

[TampaDieselFX4]

crumm- Sounds good. I was just worried about going below 50psi. But like you said, unloaded & narrow wheels (8.5" wide wheel with 12.50 tire), just remember to air up when loading. I'm going to try 45 in the rear today. See what kind of pattern that gives me.

 

[Crumm]

Once you find the right pressure you might check them for heat buildup after extended highway speeds. Mine run cool even at 35psi but the climate here is cooler than Tampa.

 

[TampaDieselFX4]

I tried the front at 50, and the rear at 45 (cold) today. Drove about 15 miles and then checked them when I got there. The rear pattern was still not 100%evenly wearing, but MUCH better than when at 50 yesterday, so I'm going to leave the rear at 45psi cold. I checked the pressure on them hot, was only at 47-48ish; tell ya how hot they are running. Then I checked the front.... ALL the paint was worn off! Checked the pressure and it was up there... 56ish. so they were running hot. the fronts ran better at 55psi vs the 50 (cold). So it seems that 55 front, 45 rear (cold) is about ideal. Tomorrow I'm going to put the fronts back up the 55 cold. and re-check the wear pattern and check the pressure when Hot, make sure it doesn't spike like it did today running them at 50 cold. Looks like having about 1/4"-1/2" of paint on each edge of the tire is about ideal.

 

[TampaDieselFX4]

Update on the tire pressure for running on stock rims. 55psi cold is perfect for the front. I tried 40psi cold in the rear today.... that was the ticket. 55/40. Quite a difference in pressure from front to rear, but the proof is in the wear pattern. I'm betting it has to do with the fact the front end has a diesel 6.0 over it, the cab, etc... and the rear has nothing. I did the math on it, based on the tire pressure our weight distribution is about 60/40, which sounds right. So I'm going to stick with the 55/40. I'm going to check the pressure hot after driving hwy speeds for a while, and see if they spike... that will tell if they are running hot and need more pressure and the rim is just to dang narrow, which I don't think is the case. Just can't forget to air up the rear when hauling/towing heavy loads... which I don't lol. I doubt a 150 Lb sofa will really affect things for a 5 mile trip.

 

[DIESEL97]

Ok stupid question ,but how would one check the wear pattern on there new tires?

 

[trackspeeder]

Ok stupid question ,but how would one check the wear pattern on there new tires?

Hold the brake and the go pedal at the same time.

 

[TampaDieselFX4]

I used Whiteout. paint a line from edge to edge. Drive around for about 1-2 miles and then look at the pattern. See how close to the edge the tire is wearing.