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04-19-2019, 05:54 PM
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#1
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Junior Member
Brand: Thor Motor Coach
State: North Carolina
Posts: 2
THOR #14720
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Tire pressure
New front tires...sidewall says 120 psi. docs in the coach say 82 psi. The mechanic at the tire company insisted 120 was correct, but I've always thought the Thor numbers should be followed. I'm thinking around 90.
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04-19-2019, 08:20 PM
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#2
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Senior Member
Brand: Thor Motor Coach
State: Missouri
Posts: 2,324
THOR #6903
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Weight is the only way to be sure of psig, scale, tire chart and decrease if the chart says so
The sticker weight is a guesstimate
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04-19-2019, 08:35 PM
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#3
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Senior Member
Brand: Jayco
Model: Alante
State: West Virginia
Posts: 192
THOR #5597
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The pressure on the sidewall is the maximum allowable for the tire at it's maximum load. There are tire charts that convert the weight to the proper tire pressure. Goodyear and Michelin have charts on their websites, but you need to have your coach weighed to get the proper air pressure.
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04-19-2019, 09:08 PM
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#4
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Senior Member
Brand: Still Looking
Model: Travato
State: Florida
Posts: 2,475
THOR #1765
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You don’t have your coach listed or the size and make of your tires. If you list them, someone will probably send you or direct you to the website that has the chart for those tires. Correct tire pressure is crucial to the handling and safety of your coach and to the wear of your tires. The only way you can know your correct tire pressure for sure is to load your coach like you intend to travel in it and go weigh your coach both front and rear. Some weigh all four corners separately, but unless you have some reason to think that one side is way different than the other - that is probably not necessary. With the front and rear weight measurements, you can then go to the tire charts and see what the tire manufacturer recommends. I think that a set of Tire Minders or similar equipment to constantly measure your tire pressures and temperatures is a necessary safety feature - if your coach is not already so equipped. All my cars have this as standard equipment and a blow out is so much more dangerous in an RV than a car. I don’t know the RV manufactures get away with not providing it as standard on all RVs.
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04-19-2019, 09:50 PM
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#5
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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Quote:
Originally Posted by Mitch S
The pressure on the sidewall is the maximum allowable for the tire at it's maximum load. .
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I agree...
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"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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04-19-2019, 11:45 PM
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#6
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Senior Member
Brand: Thor Motor Coach
State: Missouri
Posts: 2,324
THOR #6903
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Quote:
Originally Posted by Mitch S
The pressure on the sidewall is the maximum allowable for the tire at it's maximum load. There are tire charts that convert the weight to the proper tire pressure. Goodyear and Michelin have charts on their websites, but you need to have your coach weighed to get the proper air pressure.
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The sidewall psig stamp is the minimum pressure for the maximum load stated
Cold psig as it will go up when operating in hot weather
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04-20-2019, 01:11 AM
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#7
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Senior Member
Brand: Still Looking
Model: Travato
State: Florida
Posts: 2,475
THOR #1765
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Quote:
Originally Posted by lwmcguire
The sidewall psig stamp is the minimum pressure for the maximum load stated
Cold psig as it will go up when operating in hot weather
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No. The Psi tire pressure embossed on the side of the tire is the maximum cold psi that the tire is designed to hold, whether it is under any load or not. That tire and that pressure determines what safe load the tire can carry. Most tires are not (and don’t need to be) filled to max pressure. The psi in the tire will increase as the ambient air temperature increases or as you run your tires and heat them up. The front tires in my RV should be run at 80 psi or max pressure for my Michelin tires to carry the 4000lbs of weight load on the two front tires. When I travel south in the late fall, I fill those tires to 80 psi at about 50 degrees F. As I travel south and the ambient air temp increases to 60 and 70, I have to let air out of the tires in the morning to keep them below 80 psi because the psi increases with the ambient temp. When I run my tires at 70 mph on a hot road, my Tire Minders will tell me that the temp in my tires has increased from the ambient temperature to 90-100 degrees and the psi will rise 5 lbs or more. That is what the tire is designed for.
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04-20-2019, 01:29 AM
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#8
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,122
THOR #7035
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Use the pressures on the yellow sticker until you get your coach weighed and then adjust as necessary.
And steer clear of that "mechanic".
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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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04-20-2019, 01:59 AM
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#9
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Senior Member
Brand: Thor Motor Coach
Model: Vegas 24.1
State: North Carolina
Posts: 330
THOR #11380
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First: welcome to the forum.
Second: Met a Seaweed in Oak Island a couple years ago during a PGR Vietnam Wall escort with the Grand Dude. You the same person?
Third: Recommend you go to the first link on this forum and download Ed's great handbook. If you don't have a Axis/Vegas you can still use a lot of it for your particular RV.
Fourth: 75 front/65 rear are basic values for Axis/Vegas RV.
__________________
Cal Bridgers
YNCM USN-Retired (64-90)
RVN (Tet 68)
2015 Thor Vegas 24.1
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04-22-2019, 02:27 AM
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#10
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Junior Member
Brand: Thor Motor Coach
State: North Carolina
Posts: 2
THOR #14720
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Thanks to all for the info...I'll get front and rear weights shortly and check the charts. It's a 2014 ACE 29.2, and 82 psi is the number for now.
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10-26-2019, 10:24 PM
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#11
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Junior Member
Brand: Thor Motor Coach
Model: Hurricane
State: Georgia
Posts: 3
THOR #16997
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Tire psi
Took my 2018 Hurricane M 29 in for an alignment and the mechanic set my tires to 110 psi, he said that is the recommended psi, the coach sticker says they should be 85 psi. I was told if you don’t run the at the recommended psi you could have a lot of problems with the tires. Any thoughts.
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10-26-2019, 10:46 PM
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#12
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,122
THOR #7035
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Quote:
Originally Posted by RodneyR
Took my 2018 Hurricane M 29 in for an alignment and the mechanic set my tires to 110 psi, he said that is the recommended psi, the coach sticker says they should be 85 psi. I was told if you don’t run the at the recommended psi you could have a lot of problems with the tires. Any thoughts.
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Get a new alignment tech.
Just because the MAX pressure on the sidewall is 110 PSI does not mean that is the recommended pressure.
Without an accurate coach weight you should follow the MANUFACTURER's recommendation of 85 PSI on the coach sticker.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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10-26-2019, 11:27 PM
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#13
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Senior Member
Brand: Thor Motor Coach
Model: Thor Outlaw 38RE
State: West Virginia
Posts: 304
THOR #17154
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Quote:
Originally Posted by Calman
Third: Recommend you go to the first link on this forum and download Ed's great handbook. If you don't have a Axis/Vegas you can still use a lot of it for your particular RV.
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Cal - I tried to find this but can’t. Would you mind sending a link? Thank you in advance!
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10-29-2019, 06:35 PM
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#14
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Senior Member
Brand: Thor Motor Coach
State: Missouri
Posts: 2,324
THOR #6903
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Quote:
Originally Posted by Oneilkeys
No. The Psi tire pressure embossed on the side of the tire is the maximum cold psi that the tire is designed to hold, whether it is under any load or not. That tire and that pressure determines what safe load the tire can carry. Most tires are not (and don’t need to be) filled to max pressure. The psi in the tire will increase as the ambient air temperature increases or as you run your tires and heat them up. The front tires in my RV should be run at 80 psi or max pressure for my Michelin tires to carry the 4000lbs of weight load on the two front tires. When I travel south in the late fall, I fill those tires to 80 psi at about 50 degrees F. As I travel south and the ambient air temp increases to 60 and 70, I have to let air out of the tires in the morning to keep them below 80 psi because the psi increases with the ambient temp. When I run my tires at 70 mph on a hot road, my Tire Minders will tell me that the temp in my tires has increased from the ambient temperature to 90-100 degrees and the psi will rise 5 lbs or more. That is what the tire is designed for.
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Well you are partially right in that is the starting point when airing up the tire
The stamped pressure is actually the minimum for the maximum load because of what you brought up (I did not state anywhere to inflate above the sidewall psig)
If you are driving and the tires heat up as they do and the pressure increased accordingly then you are now operating your tires lets say with 90 psig which isn't now the minimum pressure but is the new pressure due to the increase from the tire operation flexing from the load and the ambient temperature
In other words you don't stop and let the pressure back down to 80 as the tires heated up and increased the pressure, you keep on driving. That
Setting the pressure cold is correct based on the maximum tire load
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10-29-2019, 09:40 PM
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#15
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Senior Member
Brand: Thor Motor Coach
Model: Thor Outlaw 38RE
State: West Virginia
Posts: 304
THOR #17154
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Rated pressure vs. running pressure
I just had an rv inspected. Inspector said that the tires were rated for 115 and the tires were inflated to 75. He suggested that if I inflated them to 100 I’d see better handling, mpg and less wear.
Does that sound right? I haven’t seen the docs inside the rv - I fly tomorrow from check it out.
It’s a 2017 THOR outlaw 38re.
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10-29-2019, 10:37 PM
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#16
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Senior Member
Brand: Thor Motor Coach
State: Missouri
Posts: 2,324
THOR #6903
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To little pressure will definitely do all that was noted
Weight per axle is the only true accurate means to determine ideal psig
75 definitely sounds to low
Mine wonders around and is dangerous on curves when pressure is too low
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10-29-2019, 10:42 PM
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#17
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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Quote:
Originally Posted by WearyTraveler
I just had an rv inspected. Inspector said that the tires were rated for 115 and the tires were inflated to 75. He suggested that if I inflated them to 100 I’d see better handling, mpg and less wear.
Does that sound right? I haven’t seen the docs inside the rv - I fly tomorrow from check it out.
It’s a 2017 THOR outlaw 38re.
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Good luck, and happy hunting!
__________________
"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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10-31-2019, 09:27 PM
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#18
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Senior Member
Brand: Thor Motor Coach
Model: Chateau 31L
State: Florida
Posts: 2,063
THOR #12189
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Quote:
Originally Posted by lwmcguire
Weight is the only way to be sure of psig, scale, tire chart and decrease if the chart says so
The sticker weight is a guesstimate
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The problem with the sticker weight is it only references the tires used when departed from the factory. McGuire is correct - reference the chart for your weight, particularly if you switch brands.
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10-31-2019, 09:37 PM
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#19
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Senior Member
Brand: Thor Motor Coach
Model: Chateau 31L
State: Florida
Posts: 2,063
THOR #12189
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Quote:
Originally Posted by lwmcguire
To little pressure will definitely do all that was noted
Weight per axle is the only true accurate means to determine ideal psig
75 definitely sounds to low
Mine wonders around and is dangerous on curves when pressure is too low
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You can go nuts with stuff and some would argue the coach is not 'balanced' and all four corners will be something different. I'm not going to obsess that far. 7200mi on a set of Michelins. I use the door jamb sticker.
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11-01-2019, 05:28 PM
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#20
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Senior Member
Brand: Thor Motor Coach
State: Missouri
Posts: 2,324
THOR #6903
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The real world way to tell if you are underinflated is to monitor the tire temperature. If you have tires you can't hold you hand on when driving in hot weather you are damaging your tires.
We ran trucks and trailer for over 50 years commercially and not one time did we ever let air out of tires when running back empty. Same goes for commercial rigs now. If you are going to error then error on the higher side of inflation, not the lower.
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