cooper discoverer at3 psi advice

[nukegm]

comrades - put on my snows the other day. these tires are quiet. smooth. very pleased. used to run goodyear durtracs....any advice on front and rear psi would be appreciated. currently i am at 65 front and 50 rear. 2018 2500. cheers all !

 

[Rob S]

nukegm,
Im still on the stock Firestone's on my truck 27,000 miles on them and I have been running 65 F 50 R since new and that seems to be a good setting for me. Im mostly not loaded much at all. The wear has been real even as well. Just rotated them Monday, and I still have plenty of tread left. Im going to with the Coopers when these Firestones are done.

 

[BarryG]

I also run 65 front and I have my rears a bit higher than 50 more like 55 to 60psi. However that is only because on a moments notice I may be hauling a trailer or hauling a larger load in the bed. These pressures still seem to run even treadwear. I will air up/down the rear for the fifth wheel or large trailer as that is much more infrequent.

Which discover at3 did you get? Just put some AT3 4s's on the wife's 4 runner and so far so good am liking them. I think I will be using the AT3 XLT on the truck next go around next year since Goodyear quit making my go to tire for the last 10 years. I drive 30-35k miles a year so tire buying for me is about every 1.5-2 years.

 

[HVAC2]

I tried the discover and after multiple attempts discount gave up on getting them balanced. I shelled out 300 and change for Michelin LTX.

Running 80 rear 60 front but towing full time. Big difference from Firestone. More stable in high winds and absorbs bumps much better.

They better last longer. Only got 27k on the Firestones.

 

[Jim W]

On my 8 year old Michelin LTX MS2 tires I run 60PSI in the front tires and 50PSI in the rear. These are on the truck for only 5 months a year and get between 2500 and 3500 miles on them a year. I have close to 50,000 miles on them now. I looked over the tires yesterday and there is no cracking, checkering or and other tire defects visible, as I mounted them on the truck. Air pressure is checked every month and adjusted as needed.

My summer tires are run at 50PSI front and 60PSI at the rear but these are a heavier ply tire (10) and are rated to support a different tire load than my Michelins are. The tire load rating is 126 for a signal wheel application.

The truck is garage kept and when the tires are off the truck, they sit in a tire rack off of the ground. I will probably replace the Michelins next fall as they are very close to aging out.

 

[Turbo Terry]

I’m not always sure about what mileage I’m getting out of tires. I run two sets winter and summer. I check tread depth and air pressure pretty often . But let’s talk aging out a bit. I have tires on now that are 12 years old. Truck is garage kept and tires properly stored. They age out faster than I wear them out. Should I really be worried about that .

 

[Jim W]

I am not sure! But my Michelins tires are 8 years old and still look new! I do know that stores like Discount Tires won’t balance or fix a flat tire if the tire is 6 or more years old. I think this is a Federal law that was put in place a couple of years ago.

 

[nukegm]

thanks for all the input fellas. i can also share that discount tire has been a colossal waste of time for me here in colorado. they cant balance anything the first, or second try, or three. multiple stores...they initially mounted and balanced this set of coopers for me. one rim had over a foot of weights on it. i put the tires on the truck and it vibrated so bad stuff was falling off the passenger seat onto the floor. anyhow, went to someone else, they didnt even charge me. tires run perfect. smoother than my stock firestones... gave them a case of soda pop as a gesture. will be using them from now on. thanks again for the input. cheers all !

 

[Cummins12V98]

I tried the discover and after multiple attempts discount gave up on getting them balanced. I shelled out 300 and change for Michelin LTX.

Running 80 rear 60 front but towing full time. Big difference from Firestone. More stable in high winds and absorbs bumps much better.

They better last longer. Only got 27k on the Firestones.

Have you ever weighed your trucks axles fully loaded then comparing to the load/inflation table for your tire size and load range?

I am betting your rear tires are overinflated.

 

[HVAC2]

I would be very cautious about any big loads on 12 year old tires at best. Seems to me after a decade or something like that they are not what they used to be.

Have you ever weighed your trucks axles fully loaded then comparing to the load/inflation table for your tire size and load range?

I am betting your rear tires are overinflated.

Last cat scale had the following
Drive. 5300
Steer 4480
Trailer. 7140
Total 16920

With that what do you rcmd for air pressure. I just keep it at max??

 

[SteelToeStilettos]

Just bought a set of these for C. Carpenter's HEMI. Very nice tire. We are running the max PSI--70-80 PSI, so we can maximize our complaints about the horrible roads in Dallas. Tres horrible! Need a helmet to ride in that thang!

 

[Cummins12V98]

Use weight/inflation Chart then add 10psi to fronts and 5psi to rears over chart.

I get AWESOME mileage, traction and ride by following this advice.

 

[TimothyLong]

Since I got my AT3's a year ago, I have experimented with different pressures to see which I like best for traction and ride for my truck. I am running 315/70/R17's, so being a bit bigger tire I can get away with lower pressures and still maintain some weight carrying ability. My truck is my daily driver, so I mostly run empty expect for my saddle box (which has maybe a a few hundred pounds of weight and not enough to really worry about). I started at 60 psi both front and rear and went from there. What I ended up with is 40 psi cold pressure, both front and rear. That being said, 40 psi is on the low end of the pressure scale and I really don't like 40 psi, but once I'm on the road and the tires heat up, the pressures go up to about 45 psi, which I find to be the optimum ride/traction range for the way that I drive with an empty truck. When I have to put a load in the back, I do add air pressure based on how much I intend to haul, but let it back out again once I empty the load.

Like you, I switched from Goodyear's (Trail Runners) to the Cooper AT3's and I absolutely love them. The only downside to them is that they can be difficult to balance, but my tire shop does a pretty good job with them. My suggestion would be to experiment with tire pressures until you find what suits you based on your hauling/towing habits. If you run empty most of the time like I do, you can get away with running lower pressures. I used the chart below (which I found on another Ram forum) as well as Thuren Fabrication recommendations and I have had no issues. Then again, I'm running several Thuren Fabrication suspension/steering components and the Thuren recommended alignment specs, so that may also have something to do with it. It's what works well for me given the setup that I have and my hauling/driving habits.

2013 Ram 2500 Laramie QC LB 4x4, Thuren Fabrication adjustable track bar, sway bar kit, and 2" leveling kit, Bilstein 5100 shocks, Westin Chrome Ultimate Bull Bar, Weatherguard Saddle Box, Line-X Bed Liner, Cooper Discoverer AT3 XLT's LT315/70/R17

 

[Jim W]

I might be incorrect but I think your tires maybe being operated at too of a low pressure. Not per the weight chart but what maybe modeled in the sidewall of the tire. I know on my "Nitto Dural Grapplers" which are LT285/70R/17 126R (10ply) tires. The tire has molded into the tire not to operate the tire below 45PSI inflation pressure cold. I operate my front tires at 55PSI and the rear at 55PSI when not towing. When I tow the rear tires are at 70PSI.

Have you checked the fine print on your tires that is molded in to the tire? To see if there is a caution note to minimum air pressure to operate at.

 

[AH64ID]

45 psi as a minimum seems really high. Normally it’s in the 25-35 range and not often printed on the tire.

I run 55/35 empty in the summer and 50/30 in the winter around town. Truck empty is 5420/3540.


I use the load and inflation tables and round up to the next 5 psi when loaded.

https://www.toyotires.com/media/3729/application_of_load_inflation_tables_20200723.pdf

 

[TimothyLong]

I might be incorrect but I think your tires maybe being operated at too of a low pressure. Not per the weight chart but what maybe modeled in the sidewall of the tire. I know on my "Nitto Dural Grapplers" which are LT285/70R/17 126R (10ply) tires. The tire has molded into the tire not to operate the tire below 45PSI inflation pressure cold. I operate my front tires at 55PSI and the rear at 55PSI when not towing. When I tow the rear tires are at 70PSI.

Have you checked the fine print on your tires that is molded in to the tire? To see if there is a caution note to minimum air pressure to operate at.

I just checked them and the only spec in the fine print is max load pressures. Thanks for the heads up though!