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Air pressure

Discussion in 'Chevy Trucks' started by dlcs, Feb 23, 2011.

  1. dlcs

    dlcs 2000 Club Member
    Messages: 2,160

    What does everyone run for tire pressure on their 2500hd's. Mine are set for 65 in the front and 80 in the rear. I have 245 75 16 hankook tires on now. Seems since i bought new tires (same size as stock) but different brand that it just beats me to death. Our roads are pretty crappy here but I can't remember ever getting beat this bad and i have alwasy ran this pressure. i really don't want to raise and lower the air pressure every time i put the plow on or load up bagged salt, so whats everyone else run?
  2. grandview

    grandview PlowSite Fanatic
    Messages: 14,609

    What does the door say for pressure? Sounds like the backs could be a little lower without any problem.
    Last edited: Feb 23, 2011
  3. dlcs

    dlcs 2000 Club Member
    Messages: 2,160

    The door says 80psi but isn't that only valid with the original tires?
  4. highlander316

    highlander316 Senior Member
    Messages: 583

    i run 75 in the rear tires on my 2500hd. Helps out when I load my 2yard spreader to the max. I think they are at 70 in the front. Mine rides rough in the rear cuz of the timbrens. I'd knock it down to 70 or 75 and see if that helps.
  5. grandview

    grandview PlowSite Fanatic
    Messages: 14,609

    nope. I go with what the door says minus a few pounds.
  6. highlander316

    highlander316 Senior Member
    Messages: 583

    no I don't believe so, its for any tire of the same size/ratings/etc I believe. The sidewall of the tire will say the max PSI for the tire.
  7. dlcs

    dlcs 2000 Club Member
    Messages: 2,160

    Maximum psi on the tire says 80 psi.
  8. dlcs

    dlcs 2000 Club Member
    Messages: 2,160

    Thanks guys, i'm going to try dropping the rears down to 70 and see if that helps. if i rememeber correctly when I bought my new tires in the fall, the dealer said my old tires were worn more in the center, does that mean too high of pressure and not having enough load in the truck?
  9. sechracer

    sechracer Senior Member
    Messages: 478

    Worn centers = too high of a pressure, evenly worn outer edges with less wear on center = too low.

    I go by how the tire looks on a flat hard surface. Run my 8ply 285/75 16's at 50 psi front and rear.
  10. chevyzrule810

    chevyzrule810 PlowSite.com Addict
    Messages: 1,288

    Tires are filled with Nitrogen 60psi in front 80psi in rear (what the door says)
  11. mayhem

    mayhem PlowSite.com Addict
    from Peru MA
    Messages: 1,016

    I run 60psi front, 50 rear in the winter, the front end carries a greater percentage of the truck's mass with the plow on and ballast in the back and it does the same with the plow off and no ballast. I don't run a big sander or anything really heavy so I don't run my tires at the full 80 psi unless I know I'm going to load a heavy load.

    I'd go by the door sticker for recommended pressures...so long as you're using 10 ply tires they meet the same basic spec for load capacity, minimum sidewall flex, etc. There should be two pressures indicated on the sticker, min and max; the 80psi is the max pressure that you use when you're loading up towards your upper load limit.

    You might be noticing an increase in ride harshness with the new tires simply because they're a different tire and the sidewalls might be inherently stiffer, either because of the construction or because they're just new and the old ones had been flexing the sidewalls for 40,000 miles and were soft.
    Last edited: Feb 24, 2011
  12. South Seneca

    South Seneca Senior Member
    Messages: 474

    I've had a hard time finding 8 ply tires. The choices here seem to be 4 or 10 ply. I like 8 ply because it seems like the compound is a bit softer for more grip on snow and ice.
  13. Burkartsplow

    Burkartsplow PlowSite Veteran
    Messages: 3,246

    70 all around for me. The truck rides better for me since I have all the weight of the plow and salter. To soft and the truck feels sluggish when turning.
  14. dlcs

    dlcs 2000 Club Member
    Messages: 2,160

    I dropped my rears down to 74 psi and what a difference. I have 1000lbs. in the back right now. Even with 1000lbs. and 800 psi, the truck roade rough as hell.
  15. dlcs

    dlcs 2000 Club Member
    Messages: 2,160

    How much weight is your salter when full, are you talking the one in your signature line?
  16. jklawn&Plow

    jklawn&Plow Senior Member
    Messages: 469

    I keep about 55-60psi in back but no balast. If i I had ballast I probably keep at 75psi if it had traction.
  17. sechracer

    sechracer Senior Member
    Messages: 478

    Thats because of the size of your tire. If you bump it up to a 265/75 16, (assuming you currently run a 245/75 16) it will make it easier.


    thats the tire I run, but mine are 285's. they seem to wear good, second winter on them, and grip great. Also not noisy at all...
  18. lawnmedic

    lawnmedic Senior Member
    Messages: 703

    Load range C 6ply and Load range D 8ply. tires are becoming are becoming harder to find as many manufacturers have discontinued making them. Most are making "P" series, 4 ply and "E" 10 ply rated....
  19. truckboy

    truckboy Junior Member
    from texas
    Messages: 23

    I think you will have to discuss this with good tire installer, because they knows on which kinds of roads and on what kind of tires, how much air pressure needs.
    BMW Motorcycles | RVs For Sale
  20. BlizzardBeater

    BlizzardBeater Senior Member
    from Maine
    Messages: 420

    All depeds on the load rating of the tire and the load on the vehicle.

    P(4ply)- between 35-44psi depending on tire.

    C 6 ply- Run 50 pounds.

    D 8 ply- Can safely run up to 65psi and as low as 50 psi.

    E 10 ply- Can safely run up to 80psi but would not run lower than 65psi.

    On higher ply rated tires, underinflation becomes a huge issue because the extra belting doesnt disperse heat as well, therefore an underinflated higher ply tire runs hotter. This means that its useful mileage is drastically decreased.