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Thread: Tire Pressure Question
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08-12-2020, 02:30 PM #11
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Not sure why you say I'm running them overinflated when the tire max is 80#? My GVWR is 10995 so 23% would be 2530. Dry weight is about 9100, we won't be hauling any water in our tank so I'm 'guessing' we'll be at 10k max. Then again I know how stuff can add up and won't really know until hitting a CAT scale. Wondering where the 23% figure comes from? Also, can you tell me how to weigh at a CAT scale, I've seen some posts but can't find them right now. Thanks.
Update: So it looks like 1st weigh would be front/rear/trailer on the 3 scales. To get the 'unhitched' weights do you then just raise the trailer off of the pin while sitting on the scale making sure the trailer stabilizers are on the back 3rd scale?Last edited by Texdan; 08-12-2020 at 03:06 PM.
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08-14-2020, 07:44 AM #12
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Well, picked up my Reflection 29RS yesterday for my first ever fiver tow. I put front tires (80# max Michelin E) at 70 front and 80 back. Truck sticker on stock 17" E is 65 front 80 back. Anywho, I am a little disappointed in that I seem to get a little chucking while driving with my 2013 Chevy 2500HD Duramax. I have a graphite plate on the pin box and greased the hitch jaws and put white lithium grease on the hitch base rubber thingies where the hitch head sits. Any ideas or is that normal? My thoughts:
1. Harder ride due to tire pressure?
2. Would truck air bags eliminate this?
3. ?????
Other than that we are already loving the fiver even in the driveway!Last edited by Texdan; 08-14-2020 at 07:59 AM.
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08-14-2020, 07:56 AM #13
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Chucking is kind of mysterious, but my recommendation is not to waste any effort resolving it until you have the rig loaded for camping and are sure the hitch and pin box are set where you want. Weight distribution can make it better or worse.
Obviously, check that your hitch is secure and working properly.
There are pin boxes that can reduce the effect, but like I said, get the rig ready to use before going down that road.John & Kathy
2014 F250 Lariat FX4 6.2L SBCC
2014 Reflection 303RLS
SW Indiana
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08-14-2020, 07:58 AM #14
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08-22-2020, 04:20 PM #15
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Mal & Helen
With Mitzi our Yorkie
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08-23-2020, 08:54 AM #16
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I have weighed my truck with and without my 29RS. I have used the Firestone tire rating chart to tell me I should run 65 psi empty on the Ram rear axle. But, the Ram TPMS does not like 65 and alerted me all the time. I just went back to 80 and the Ram system was satisfied.
Also, I have a Reese Goose Box hitch and run 42 psi in the air bag and the 29RS tires at 65 psi. I monitor tire temp and pressure and temp with a BellaCorp TPMS. I check tire, axle hub and drum temps when I stop for a break. i am looking for major deviations in temps as a sign for impending issues.
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08-23-2020, 02:33 PM #17
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08-23-2020, 09:11 PM #18
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Spike & Kimberly
2020 Imagine 2970RL
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2002 GMC 2500HD 6.6L -Traded
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10-04-2021, 09:07 PM #19
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I’m adding to this thread to ask for more clarity, if I may. I will be grateful for more education. I’ve been googling a bit on tire load tables and I think what I’ve found makes sense. Although, the general advice of “just do what the sticker says” becomes unsatisfying when I realize (and see how) the sticker number is set according to the GAWR number, which would be overinflated if I’m less than the max weights.
According to my reasoning below, I think I would set my tires at 40 PSI front, 50 PSI rear, for a tire that says 80 PSI on the sidewall at maximum weights. Am I doing it right?
My truck doesn’t have the yellow tire load sticker, but the VIN configuration sticker shows PSI that matches the table at tirepressure.com for the tire at the GAWR. Running both axles at GAWR would go over the GVWR by 50%. The OEM tire was LT265/75R16E. The PSI on the sticker are 55/70.
Here are my questions:
My current tire is LT285/75R16E, which has quite a bit more load capacity for the same PSI (12% more at 50 PSI). If I look up the chart by my actual CAT scale weight, with camper on the truck, I get surprisingly low PSI answers.
Front Axle: 3960 or 1980# per tire
This falls off the bottom of the chart at 2130# and 35 PSI. The GAWR would be b/t 35 and 40.
Rear Axle: 4700 or 2350# per tire
This lands on the chart at 2340# 40 PSI. The GAWR would be b/t 55 and 60.
If I add 10% to actual weights (for 2178 and 2585) and “round up” on the table, I end up with 40 PSI for front wheels and 50 PSI for rear wheels.
Would 40/50 be the numbers you would go with? Do I use the tables correctly?
Setting all the tires to 80 PSI would be preparing them for 15000# of load (3750x4), which is 70% over the truck’s 8800 GVWR. That all seems to make sense.
I used the chart at https://tirepressure.com/lt285-75r16-tire-pressureDouglas & Christine
2019 Ford F-250 XLT 6.2L V8 Fx4 Crew Cab short-bed
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10-05-2021, 07:33 AM #20
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JMO of course, but I don't think I would go that low with a load. The lower the pressure with a load, the more the tire will flex, the more the tire flexes the more heat it produces. Heat is a tire's enemy. But as I said, I'm no tire engineer, JMO.
Howard and Peggy
2019 Momentum 351M, and 2018 RAM Cummins dually 6-speed.
His: 1999 Honda Interceptor
Hers: 2013 Spyder ST-S
Sad trailer this week
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