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dog walker 08-10-2002, 03:58 PM What do you cats run? My tires are 235/85/16 and have a max cold PSI rating of 80lbs, I run 45psi, but my tires are cuping a bit, so I bumped them up to 65psi. My last 1 ton dually I always ran 45psi with no problems, but I'm having issues with my 97 Chevy 4x4 dually. 65psi just seems like alot of air pressure, let alone 80psi! Whata all think? Jeff That Mick 08-10-2002, 04:21 PM For a D/E rated tire, 80 psi isn't out of the ordinary. For a rig that is used just for towing, I'd run max psi -5 lbs. Modern tires are designed to bear the most wieght at max psi. smurfsdad 08-10-2002, 04:59 PM My new Dunlops on my F350 are cupping and they are at max pressure as stated on the tire. I dont think its the tire as much as another problem that needs to be addressed. hy_desert_4wheeler 08-11-2002, 05:50 PM I think cupping is usually caused by bad shocks Red Chevy Girl 08-11-2002, 09:06 PM I have several tow rigs and I run about 5 below what they are rated for and mine are rated for 80 PSI, but i also haul alot of live weight and i'm routinely overloaded so i like the higher pressure on them, and even with light loads i like them at that pressure to. EMIEVEL 08-12-2002, 09:00 PM I think the cupping is from too light of a load with real stiff suspension. Shocks cause this also, but Smurfsdad has a newer truck, right? My 50' trailer can destroy a tire if I'm running empty across country, but when I'm loaded, they wear fine. Norm 08-13-2002, 09:10 AM I have a 3500 dually . Loaded at 11,500 on the truck I run 70 front and 65 rear. Since I'm running ~7500LBS on 4 load range E tires in the rear, I think 75 would be over inflated for the rear. 4K on the front axle seems about right with 70. 45 LBS all around empty seems about right. Lord Baskerville 08-13-2002, 08:21 PM Cupping is a shock or other susp problem... I run approc 60 PSI in my max 80 PSI tires daily. Actually gonna drop that some as the centers are whearing a bit too fast at that pressure. When I used to load the back to the cab top with wood 60 made the tires look flat the one time I forgot to top them up. Here is an interesting idea... Look in the door frame or the owners manual:flipoff2: Cory dog walker 08-13-2002, 10:05 PM Look in the door frame or the owners manual It says 80psi, but like I said, 80 seems very high to me. And I've always known that shock can cause cupping, but so can other things like being under inflated because that will cause the suspension and tire to bounce more which will lead to all types of strange wear patterns. I've been running the front tires at 65psi for the past few days, and it seems to handle and ride smoother now. Also the tire is almost the same height as the rears now. They were about an inch shorter due to the 45psi I was running. Jeff | |