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    Tire Pressure Question

    Picking up my new Reflection 29RS fiver with GVWR of 11k and 9100 dry tomorrow. I have a 2013 Chevy 2500HD Duramax with Michelin 18" tires, max pressure rating 80lbs. I normally kept them at 70# when pulling my 7k bumper pull. Should I take the tires up to the max 80# since I'll have an additional 2500-4000#?
    Last edited by Texdan; 08-12-2020 at 09:19 AM.

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    What does the sticker on the door pillar say?
    John & Kathy
    2014 F250 Lariat FX4 6.2L SBCC
    2014 Reflection 303RLS
    SW Indiana

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    Site Team Second Chance's Avatar
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    If you're running them at 70 PSI while unloaded, you're probably running them overinflated. This will result in a rough ride and wear in the center of the tire. As stated by @jkwilson, use the pressures on the truck's door sticker. Unless there is a separate pressure listed for the rear when loaded, use the door sticker pressure all the time.

    Rob
    U.S. Army Retired
    2012 F350 DRW CC LB Lariat PS 6.7
    2020 Solitude 310GK-R, MORryde IS, disc brakes,
    Sailun LRG tires, solar, DP windows, W/D
    (Previously in a Reflection 337RLS)
    Full time since 08/2015

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    Quote Originally Posted by Second Chance View Post
    If you're running them at 70 PSI while unloaded, you're probably running them overinflated. This will result in a rough ride and wear in the center of the tire. As stated by @jkwilson, use the pressures on the truck's door sticker. Unless there is a separate pressure listed for the rear when loaded, use the door sticker pressure all the time.

    Rob
    Well, here's what's on Michelin's site (and max info on my tire):

    3180/6190@65#; 3360/6720@70#; 3530/7060@75#; 3640/7280@80#

    I'm figuring my pin weight will be around 2k give or take 100#. So I'm thinking tire pressures could be any of these?

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    Site Team Second Chance's Avatar
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    Quote Originally Posted by Texdan View Post
    Well, here's what's on Michelin's site (and max info on my tire):

    3180/6190@65#; 3360/6720@70#; 3530/7060@75#; 3640/7280@80#

    I'm figuring my pin weight will be around 2k give or take 100#. So I'm thinking tire pressures could be any of these?
    The tire engineers don't know what vehicle the tires are going on - the vehicle engineers do (know both tire and vehicle). The sticker on the truck is the best guidance.

    Rob
    U.S. Army Retired
    2012 F350 DRW CC LB Lariat PS 6.7
    2020 Solitude 310GK-R, MORryde IS, disc brakes,
    Sailun LRG tires, solar, DP windows, W/D
    (Previously in a Reflection 337RLS)
    Full time since 08/2015

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    Quote Originally Posted by Second Chance View Post
    The tire engineers don't know what vehicle the tires are going on - the vehicle engineers do (know both tire and vehicle). The sticker on the truck is the best guidance.

    Rob
    But the sticker is for stock 17" tires. Mine were changed to 18. Does that matter?
    Attached Thumbnails Attached Thumbnails Truck tire sticker 1.jpg  

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    Site Team Second Chance's Avatar
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    Quote Originally Posted by Texdan View Post
    But the sticker is for stock 17" tires. Mine were changed to 18. Does that matter?
    Yes - but perhaps not much if the tires are the same load range (probably E on the truck). To be sure, consider weighing your truck at the nearest CAT scale and inflating the tires per the load chart for that specific tire. You're shooting in the dark with non-OEM tires if you don't know your actual weights.

    Rob
    U.S. Army Retired
    2012 F350 DRW CC LB Lariat PS 6.7
    2020 Solitude 310GK-R, MORryde IS, disc brakes,
    Sailun LRG tires, solar, DP windows, W/D
    (Previously in a Reflection 337RLS)
    Full time since 08/2015

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    Quote Originally Posted by Second Chance View Post
    Yes - but perhaps not much if the tires are the same load range (probably E on the truck). To be sure, consider weighing your truck at the nearest CAT scale and inflating the tires per the load chart for that specific tire. You're shooting in the dark with non-OEM tires if you don't know your actual weights.

    Rob
    So what CAT scale reading would I be using to adjust my pressures? Is there any harm in running full 80psi on all 4 other than a hard ride? Or 80 on back and maybe 65 or 70 on front to start?

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    Quote Originally Posted by Texdan View Post
    So what CAT scale reading would I be using to adjust my pressures? Is there any harm in running full 80psi on all 4 other than a hard ride? Or 80 on back and maybe 65 or 70 on front to start?
    The CAT scale would give you weights for both the steer (front) and drive (rear) axles. You would divide each of those weights by two to get the weight on each wheel. The only "harm" from running over-inflated is, as I said, abnormal wear in the center of the tire. If there is a truck tire shop near you, they could probably look at your truck and tires and give you some good advice. It will be good to have CAT scale weights for your rig - both hitched and unhitched - to know what you actually have. BTW - your 29RS fully loaded will likely put somewhere around 2,640 lbs. on the pin (23% of GVWR).

    Rob
    U.S. Army Retired
    2012 F350 DRW CC LB Lariat PS 6.7
    2020 Solitude 310GK-R, MORryde IS, disc brakes,
    Sailun LRG tires, solar, DP windows, W/D
    (Previously in a Reflection 337RLS)
    Full time since 08/2015

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    Quote Originally Posted by Texdan View Post
    Is there any harm in running full 80psi on all 4 other than a hard ride? Or 80 on back and maybe 65 or 70 on front to start?

    No, that's what the sticker says anyway. I run my at 80 in the back and 70 in the front all the time loaded or not.
    2021 Solitude 375 RES-R
    2024 GMC Denali ultimate DRW

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