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10-19-2018, 03:03 PM
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#1
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Member
Join Date: Jul 2018
Posts: 95
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Whats the required tire pressure for my RV
The tires are 275 / 80 R 22.5.
Thank you 
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10-19-2018, 03:22 PM
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#2
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Member
Join Date: Aug 2016
Location: In the beautiful northwest
Posts: 93
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Quote:
Originally Posted by mckyver
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Find the weight of your coach first...by corner if possible. Then look at the table for your tire pressure from the tire company, found on line if necessary. This is not a quessing time, weigh first.
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10-19-2018, 03:37 PM
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#3
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Senior Member
Join Date: Feb 2018
Location: Monticello, IL
Posts: 1,696
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...or locate the FMVSS tire placard that is located somewhere on/in your coach which lists the recommended tire pressures for the OEM tires. That's a reasonable place to start, if you want to get exact then by all means have it weighed and look at the inflation charts for the tires, but realize those inflation charts are showing the minimum pressure for a given tire load. Those are not recommended pressures as recommended pressures come from the vehicle manufacturer, not the tire manufacturer.
__________________
2017 GMC Canyon - CCLB, 4x4, 2.8L Duramax, ARE Z-series shell
2013 Shamrock 21SS
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10-19-2018, 04:56 PM
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#4
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Senior Member
Join Date: Jun 2017
Posts: 415
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Quote:
Originally Posted by DieselDrax
but realize those inflation charts are showing the minimum pressure for a given tire load.
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ABOVE is the correct answer. Those inflation charts are handy, but those are the MAXIMUM loads for a given pressure. They are NOT the perfect pressure for that load.
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10-19-2018, 07:05 PM
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#5
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Member
Join Date: Aug 2016
Location: In the beautiful northwest
Posts: 93
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Quote:
Originally Posted by kfergiez
ABOVE is the correct answer. Those inflation charts are handy, but those are the MAXIMUM loads for a given pressure. They are NOT the perfect pressure for that load.
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On our coach, the placard shows 120psi...after weighing and following manufacturer's table. I use 98lb up front, 105lb, rear and we comply having a nice ride as well.
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10-19-2018, 07:54 PM
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#6
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Senior Member
Join Date: Jun 2017
Posts: 415
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Quote:
Originally Posted by Welshes
On our coach, the placard shows 120psi...after weighing and following manufacturer's table. I use 98lb up front, 105lb, rear and we comply having a nice ride as well.
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Which is fine... That's what the table is for. But just keep in mind that you are now and the absolute maximum weight for that given pressure. If you decide to load a few bikes on, load a ton of food on board, your tires are now under-inflated.
People usually think "The chart says I need 100 psi for X,XXX lbs." When in reality, the chart is stating "100psi is the MINIMUM amount of psi needed for X,XXX lbs.
Just be mindful. That's all I'm asking.
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10-19-2018, 07:58 PM
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#7
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Member
Join Date: Aug 2016
Location: In the beautiful northwest
Posts: 93
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Quote:
Originally Posted by kfergiez
Which is fine... That's what the table is for. But just keep in mind that you are now and the absolute maximum weight for that given pressure. If you decide to load a few bikes on, load a ton of food on board, your tires are now under-inflated.
People usually think "The chart says I need 100 psi for X,XXX lbs." When in reality, the chart is stating "100psi is the MINIMUM amount of psi needed for X,XXX lbs.
Just be mindful. That's all I'm asking.
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True, my axle weight called for 92#, so I allowed for extra stuff...same on rear tires. I carry about 5#over minimum, but well under 120#.
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10-19-2018, 09:52 PM
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#8
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Senior Member
Join Date: Jun 2017
Posts: 415
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Quote:
Originally Posted by Welshes
True, my axle weight called for 92#, so I allowed for extra stuff...same on rear tires. I carry about 5#over minimum, but well under 120#.
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I used to work for a major school bussing contractor as an ASE diesel tech. We filled the bus tires to 120 pounds no matter what. DOT regs and company policy mandated those kinds of things so when I hear about people talking about the dreaded "chart" my hands get clammy. I've seen several blowouts because of under-inflation, or over-loading.
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10-19-2018, 09:56 PM
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#9
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Member
Join Date: Jul 2018
Posts: 95
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Quote:
Originally Posted by DieselDrax
...or locate the FMVSS tire placard that is located somewhere on/in your coach which lists the recommended tire pressures for the OEM tires. That's a reasonable place to start, if you want to get exact then by all means have it weighed and look at the inflation charts for the tires, but realize those inflation charts are showing the minimum pressure for a given tire load. Those are not recommended pressures as recommended pressures come from the vehicle manufacturer, not the tire manufacturer.
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Thanks.
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10-19-2018, 11:03 PM
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#10
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Senior Member
Join Date: Dec 2015
Location: Middletown, DE
Posts: 166
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Whats the required tire pressure for my RV
Quote:
Originally Posted by mckyver
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Go to michelinrvtires.com
Good reference material on motor home tires.
Tire pressures need to be set based on the loaded weight of the motor home.
You may even have a copy of the Michelin RV tire guide in all the manuals that came with the RV we did.
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10-21-2018, 09:28 AM
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#11
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Member
Join Date: Jul 2018
Posts: 95
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Quote:
Originally Posted by Welshes
On our coach, the placard shows 120psi...after weighing and following manufacturer's table. I use 98lb up front, 105lb, rear and we comply having a nice ride as well.
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had it weighed and the chart gives me 95 frt and 85 rear , why would i have less air rear than frt ?
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10-21-2018, 09:32 AM
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#12
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Senior Member
Join Date: Feb 2018
Location: Monticello, IL
Posts: 1,696
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Whats the required tire pressure for my RV
Quote:
Originally Posted by mckyver
had it weighed and the chart gives me 95 frt and 85 rear , why would i have less air rear than frt ?
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Again, the chart shows minimum pressures for a given load. Those aren’t the recommended pressures.
Also, don’t forget you have 4 tires in the rear to carry the load on the rear axle vs 2 in the front.
__________________
2017 GMC Canyon - CCLB, 4x4, 2.8L Duramax, ARE Z-series shell
2013 Shamrock 21SS
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10-21-2018, 09:46 AM
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#13
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Member
Join Date: Jul 2018
Posts: 95
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Quote:
Originally Posted by DieselDrax
Again, the chart shows minimum pressures for a given load. Those aren’t the recommended pressures.
Also, don’t forget you have 4 tires in the rear to carry the load on the rear axle vs 2 in the front.
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thanks.
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12-21-2018, 08:37 PM
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#14
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BobbyJ
Join Date: Jan 2016
Location: State College, Pa
Posts: 153
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You must go by the Michelin Tire Chart after weighing your vehicle. Then " according to Camp Freightliner" Use the 5-10-10 rule. This due to extra weight allowance as mentioned in some other posts. The 5-10-10 rule is simple. After you have determined the correct tire pressure add 5 lbs to each front and 10 to each rear, and 10 to the tag, if you have one. My 2018 40C worked out to 95 rear and 100 front, or 105 rear and 105 front after the 5-10-10. Call Freightliner in Gaffney and talk to Mike or one of the Camp Freightliner instructors. Yes, do not, do not go by the number on the coach. Also, all tire pressures are cold. The definition of a Cold Reading is 0 degrees F here in the frigid north and 100 degrees F in Death Valley. It is just your ambient atmospheric temperature prior to driving no matter where you are or where you live. Just remember to recheck the PSI prior to your next trip, if you are traveling to a large temperature change. (Clear as mud, right?)
Regards,
BobbyJ
State College Pa
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