Can't get even wear on rear Mastercraft Courser AXT tires

Stupid question of the day: I recently put on Mastercraft Courser AXT in the stock 245/75-16 sizing. Normally I run the PSI higher than the sticker, but on these tires, seems I can't. I have the front at 32 psi and the back at 30, the lowest recommended, and I still can't get the back tires to wear evenly across the surface. They still appear to be over inflated. I did the chalk test to confirm. I am not a fan of lowering the PSI any further, but my anal-re-tentativeness is taking over.

Does anyone have any experience with these tires? I don't have any weight in the bed, so I expect to see a difference front to back, but I am guessing I need to run at 28 PSI to get an even wear. That just seems too low. Any thoughts? Is there something else in the suspension that would cause the tires to appear over inflated?

 

What load range?

 

I got the Standard Load. Is that C?

 

I run the same tires just different size. I'll check the PSI mine are at during lunch. Mine are a pretty stiff ride... but they are on 18 inch wheels too.

 

I see P rated, c, and e
Fwiw

 

You really need to look on the tire. The factory load range is C I believe, but that tire comes in C and E. If it is an E rated tire, it may require a bit less pressure. The chalk test is a good way to find the right pressure. I have run a couple of sets of the Mastercraft Courser in LR-E and they were great tires. For an E tire they were pretty soft riding too. The sidewalls are just 2 ply on the Courser, even in the E rating. If you use your truck much offroad, E is the way to go.

 

Factory load range isnt Passenger?

 

@winkeldc ur checking them cold right?

Its sometimes overlooked and the pressure can vary by a few lbs.

 

Factory load range is P metric or SL and 29psi is the factory recommended tire pressure.

 

You're right, it is P. No wonder . Toyota never intended this to be a truck, just look like a truck.

 

Im pretty sure p rated is over rated for the payload anyhow

 

yep!

 

I have always ran SL tires and never had an issue. From towing and hauling to off roading.

 

Thanks all. Tire says standard load on the sidewalk and mastercrafts website said either c or e, so I assumed the standard load was their c rated tire. I do check stone cold, did the chalk test first thing this morning. I’ll try 29 psi after work and see what that does. I attached a pic to show what I’m seeing.

 

Follow the chalk, and rotate often. The front ends on these trucks will cup the tires. I rotate mine at every oil change

 

35psi

 

And this is for future reference too, if I air down to get the even wear according to the chalk test, if that goes below the recommended tire pressure, is that okay? Or do I have to test the heat as well (check the tire pressure hot and see if difference is within 10% of the cold psi).

 

It's not a bad idea to check the tires on long hot drives. In general though, the chalk test should get the right pressure. Remember that the "recommended pressure" is for the "recommended" tires. If you change tires, you will most likely need to adjust the pressure. Even the same size tire may have differences. Remember too that vehicles do not ride on pressure. They ride on volume. It takes a certain volume to support a certain load. The higher the pressure, the more volume you are stuffing in. Load range E tires can carry more weight because they can contain more pressure....more volume compressed into the tire. A good example are bicycle tires. If you were to compare the actual uncompressed air in a mountain bike tire, and road tire, you would find them to be about the same. The pressure has to be higher on the road tire to get the same volume of air inside. Huge tundra tires can carry a heavy vehicle at 3 PSI. It's all about volume.

 

Thanks for the explanation. Sounds like I was worried about going below the recommended for nothing.

 

Adjust the pressure down to what the chalk test indicates, then go for a 15 - 30 minute highway drive. Pull over and check the sidewall temperature with your hand. If it's hot to the touch, go up a little in PSI. If it's just warm, you're fine. I don't think I've ever run a vehicle at the door sticker recommendation.