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Old 11-19-2020, 12:03 AM   #21
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Brand: Thor Motor Coach
Model: Challenger GT
State: Washington
Posts: 3
THOR #4517
We have a 2016 Challenger with the same tires. We installed after-market front-end steering stabilizer, rear-end sway bar and Sumo springs front & back. We use a TPMS as well. Typically, we run with 30 to 80 gallons gas and 25 to 75 gallons water. Typical highway speed is 55mph, very rarely over 60mph – gives us the best milage. We also tow a Honda Fit. With all that, we run all 6 tires at 90psi @ 70F. We have been doing that for 4 years. Pressure alarm set for below 81psi and over 120psi. Never had a problem. Tires are holding up just fine, handling has been just fine. We put on value extenders to make it easier to add air. Also purchased in a Viair air pump – love it. On really hot days going uphill we sometimes hit 125psi, but that is rare. Hope that helps.
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Old 11-19-2020, 02:41 AM   #22
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Brand: Thor Motor Coach
State: California
Posts: 185
THOR #17478
If you have not had your rig weighed, use the max weight front and rear. Go to the weight/pressure chart for the psi required for that weight and add five psi. That way you will not be adjusting the pressure every time the temperature changes in the morning. Then get it checked at a CAT scale fully loaded and adjust accordingly.
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Old 11-19-2020, 07:16 PM   #23
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Brand: Thor Motor Coach
State: Illinois
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THOR #20161
thor 37 fh 2020

I have the exact same rig and have kept TP at 95 cold as the TP gets up to 120 when driving depending on temperature. This is where my dealership sets them. Assuming this is in line with manufacturer.
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Old 11-22-2020, 01:55 AM   #24
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Brand: Thor Motor Coach
Model: Challenger 37FH
State: California
Posts: 30
THOR #19539
Quote:
Originally Posted by jadatis View Post
With my made spreadsheet , it comes to Front 91 psi and rear 100 psi.

Disclaimer: you yourselfe are responcible for the given axleweights . And that is where it goes wrong often. Best is weighing per axle-end, second best per axle, in the loading ( also persons and pets) you drive with ( dont forget the water).

My advice is calculated with a formula that leads to higher pressure then the officially used, and I first add 10% to the load.
Your trucktires are most likely calculated in maximum load for 120kmph/75mph, and sometimes I even calculate for as if 160kmph/99mph. This together with the 10% adding, it gives highest reserve, with still acceptable comfort and gripp.
Will give those psi too. FRONT 102 PSI , REAR 103 PSI.
But this is still no 110 psi.
For this I lowered the single maxload for every 10kmph by 1 loadindex step, so front 138 -4=134
and rear from 135 to 134 only , because duall load already have lesser deflection.
That exlplaines the only 3 psi higher for rear, while front goes from 91 psi to 102 psi.

So if you are certain of the axleweights, first lower to front 100 and rear 105psi. Then if comfort is acceptable, dont go lower. Especially the 10 psi lower on front is noticed by driver and codriver in comfort,because seated close to the front-axle.


thank you.
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Old 11-22-2020, 01:56 AM   #25
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Brand: Thor Motor Coach
Model: Challenger 37FH
State: California
Posts: 30
THOR #19539
Quote:
Originally Posted by Aussie View Post
We have a 2016 Challenger with the same tires. We installed after-market front-end steering stabilizer, rear-end sway bar and Sumo springs front & back. We use a TPMS as well. Typically, we run with 30 to 80 gallons gas and 25 to 75 gallons water. Typical highway speed is 55mph, very rarely over 60mph – gives us the best milage. We also tow a Honda Fit. With all that, we run all 6 tires at 90psi @ 70F. We have been doing that for 4 years. Pressure alarm set for below 81psi and over 120psi. Never had a problem. Tires are holding up just fine, handling has been just fine. We put on value extenders to make it easier to add air. Also purchased in a Viair air pump – love it. On really hot days going uphill we sometimes hit 125psi, but that is rare. Hope that helps.


Thank you.
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Old 11-22-2020, 02:34 PM   #26
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Brand: Thor Motor Coach
Model: Citation
State: Texas
Posts: 393
THOR #8139
[QUOTE=Sdkim;263872]
Quote:
Originally Posted by Lt Keefer View Post
What does the tire manufacturer

Attachment 27123

I think, according to the chart, 110 psi. But it just seems really high to me.
Bump
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