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06-20-2019, 05:35 AM
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#1
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Established Member
Join Date: Oct 2018
Location: Caledonia
Posts: 25
M.O.C. #22809
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well now we have done it!
Just purchased new sailun s637 tires for our 2013 3100rl and not sure and there has been many post on this about tire pressure I know that most people run them at 110 psi,on other forums the people focus on the wight caring capacity and the reserve and use a formula to figure out tire pressure . I am confused by this I thought most run them at 110 .so I am asking for a little guidance with tire pressure thoughts as we are about to be on the road for a bit thanks for any and all help with this.
Bob
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06-20-2019, 06:11 AM
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#2
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Montana Fan
Join Date: May 2015
Location: Livermore
Posts: 492
M.O.C. #17391
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110 is the recommended tire pressure from the manufacturer. So you need to have the correct wheels that can hold that much air pressure. I have a 03 with 80 PSI wheels so I cant use those tires. The manufacture has figured and tested all tires they make for all road conditions that is how they come up with the recommended tire pressure. The manufacturer has also given the max load the tire can hold with the 110 PSI. Anything under the max air PSI lowers the load the tire can carry. The max load is stamped on the sidewall along with date and tire size max PSI.
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06-20-2019, 07:00 AM
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#3
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Montana Master
Join Date: Mar 2016
Location: Catoosa
Posts: 780
M.O.C. #18384
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You can go to Sailuns web site and see an inflation chart showing psi for different weights for your particular tire. He Sailuns sidewalls are very stiff, so I'm not sure that running 10 or so pounds less would make much difference in the ride.
__________________
2015 3100RL legacy...2005 Ford F-250 CC SB. Tows like a charm! 4/19 Updated to 2017 Chevy 3500 CC SB SRW -hope it tows as well as my F 250 did!
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06-20-2019, 08:43 AM
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#4
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Established Member
Join Date: Oct 2018
Location: Caledonia
Posts: 25
M.O.C. #22809
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Quote:
Originally Posted by Slow Hand
110 is the recommended tire pressure from the manufacturer. So you need to have the correct wheels that can hold that much air pressure. I have a 03 with 80 PSI wheels so I cant use those tires. The manufacture has figured and tested all tires they make for all road conditions that is how they come up with the recommended tire pressure. The manufacturer has also given the max load the tire can hold with the 110 PSI. Anything under the max air PSI lowers the load the tire can carry. The max load is stamped on the sidewall along with date and tire size max PSI.
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thank you for the quick reply I have checked the wheels and the are stamped 110 psi .I was worried about this too so checked it out in past threads it has been posted that keystone stated to put on g wheel on most models in 2012 so i thought i had a 50/50 chance and got lucky thanks for the info that sounds like thats what I need to do
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06-20-2019, 12:26 PM
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#5
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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I run mine between 105 and 110# since we were we go we experience a lot of different altitudes and temperatures and this keeps me in the proper range without having to make a lot of changes.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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06-20-2019, 02:08 PM
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#6
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Established Member
Join Date: Oct 2018
Location: Caledonia
Posts: 25
M.O.C. #22809
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Thanks DQ Dick I wasn't real sure as there seams to be as many opinions on this, as there is tire brands between the wheels psi and the tire psi. wifey is as nervous as a long tail cat in a room of rocking chairs about all of this as the does not seam to be one sure correct answer to all of this info . again thanks for the input as it helps me with a starting place. Bob
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06-20-2019, 02:22 PM
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#7
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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You're welcome! Also, for both you and your wife's peace of mind be sure to get a good tire pressure monitoring system. I use TST 507 flow thrus. TST because of their customer service and flow thrus because I'm lazy and it's hard enough for me to get down there and I don't want to spend any more time than I have too.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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06-20-2019, 05:26 PM
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#8
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Montana Master
Join Date: Jan 2015
Location: Taylors
Posts: 562
M.O.C. #15948
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First, I’ll have to ask this question. What size Sailun tires have you installed?
The inflation pressure on the tire sidewall IS NOT a recommendation. It’s the amount of cold inflation pressure necessary for the tire to provide its maximum load capacity. That maximum load capacity is also shown on the tire sidewall.
In accordance with tire industry standards, replacement tires MUST provide a load capacity equal to or greater than the Original Equipment tires provided.
If you are replacing ST235/80R16 LRE tires with ST235/80R16 LRG tires they are both the same designated size. The only major difference is the LRG will provide much more load capacity. The correct inflation pressure for them will start at 80 PSI with optional increases all the way to 110 PSI. A tire load inflation chart for that designated size works at all load range levels or in increments in between load ranges. IMO you’re wasting your money if you do not provide at least 15% in load capacity reserves above the vehicle certified GAWR.
The ST235/85R16 is a “plus sized” tire when used to replace a ST235/80R16 tire . A load inflation chart for that designated size will be needed to establish a new recommended cold inflation pressure as a starting point. Once established, you can then figure-out what PSI is needed to gain the 15% in load capacity reserves.
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06-26-2019, 02:03 PM
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#9
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Montana Fan
Join Date: Aug 2016
Location: Cave Creek
Posts: 124
M.O.C. #18896
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tire size
They do have 235/80r16G for our trailers.
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06-26-2019, 02:21 PM
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#10
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New Member
Join Date: Apr 2014
Location: Foley
Posts: 5
M.O.C. #14192
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I do not have YOUR brand tire. I have Goodyear G614s. I called GY and they said the 110 is the MAX and asked how much weight is on each tire. From that information they told me to run 95 PSI. Use the pressure on the chart that matches your weights on your tires.
And an absolute 2nd to the suggestion of a good tire monitor system, and I too use TST 507. Peace of mind.
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06-26-2019, 04:17 PM
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#11
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New Member
Join Date: Feb 2019
Location: Jefferson City
Posts: 5
M.O.C. #23549
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First, I very much appreciate this forum. We've had our Monty for about 5 months. You all have taught me so many great things as we get started in the RV world.
I put G rated all-steel belted tires on my Montana 2850FK. I checked the Monty's alloy wheel and the stamp says 110 lbs. I had four MasterTrack st235/80r16 UN-All Steel ST Trailer Radial Tires installed. Not sure how these compare to the Sailuns that you all talk about. So far I have put about 4300 miles on the the MasterTracks. They are rated to inflate at 110 lbs cold, but at that pressure they run 123 lbs hot. That pressure hot is probable ok for the wheels but I wanted to back down a little. I tried 103 lbs cold which yielded 113 lbs hot, and they were HOT to touch (because they flex more at the lower pressure and flex creates friction and heat). I settled on 107 lbs cold and they run about 115 hot with less heat than at the lower pressure. I am sure my experiment is affected by the heat of the pavement on a given day, but I tried to match conditions - mostly. With the sorry shape of the some of the highways I feel more comfortable with the steel belted G rated tires.
One more thought: I found that not all gas station air compressors can push 110 lbs. At one gas station I tried to put a little more air in my tires and it simply was not working. I discovered that my tires where pushing air into the gas station air tank - not good!
__________________
2017 Montana 3820FK, 2019 Ford F350 Diesel SRW, crew cab, long bed, 25k Companion Hitch, 400 watts solar, two 100Ah 12V LiFePO4 (Lithium Iron Phosphate) batteries.
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06-26-2019, 05:59 PM
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#12
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Montana Master
Join Date: May 2017
Location: South East NC
Posts: 1,768
M.O.C. #19865
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Sailun provides a chart down to 80psi for lighter trailers or lighter wheels. Have had them on 3 5ers without a problem.
__________________
John & Patty
2022 3855 BR
2019 Lariat F350 4X4 Dually
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06-26-2019, 10:39 PM
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#13
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Montana Master
Join Date: Jan 2015
Location: Taylors
Posts: 562
M.O.C. #15948
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Quote:
Originally Posted by kenb
First, I very much appreciate this forum. We've had our Monty for about 5 months. You all have taught me so many great things as we get started in the RV world.
I put G rated all-steel belted tires on my Montana 2850FK. I checked the Monty's alloy wheel and the stamp says 110 lbs. I had four MasterTrack st235/80r16 UN-All Steel ST Trailer Radial Tires installed. Not sure how these compare to the Sailuns that you all talk about. So far I have put about 4300 miles on the the MasterTracks. They are rated to inflate at 110 lbs cold, but at that pressure they run 123 lbs hot. That pressure hot is probable ok for the wheels but I wanted to back down a little. I tried 103 lbs cold which yielded 113 lbs hot, and they were HOT to touch (because they flex more at the lower pressure and flex creates friction and heat). I settled on 107 lbs cold and they run about 115 hot with less heat than at the lower pressure. I am sure my experiment is affected by the heat of the pavement on a given day, but I tried to match conditions - mostly. With the sorry shape of the some of the highways I feel more comfortable with the steel belted G rated tires.
One more thought: I found that not all gas station air compressors can push 110 lbs. At one gas station I tried to put a little more air in my tires and it simply was not working. I discovered that my tires where pushing air into the gas station air tank - not good!
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Just a little info for thought. To provide the recommended 10% in load capacity reserves from your current tires the minimum cold inflation pressure should be maintained at 100 PSI. 110 PSI would be best.
Servicing your tires at a service station is not recommended. The tires will be warm from the trip to the station.
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06-27-2019, 06:07 AM
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#14
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Montana Master
Join Date: Aug 2009
Location: Grand Rapids
Posts: 1,896
M.O.C. #9561
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What? Do what is listed on the tire: 110psi. Ok, do 100psi.
Just make sure your wheels are rated for this psi
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06-27-2019, 09:46 PM
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#15
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Seasoned Camper
Join Date: Jun 2019
Location: Sequim
Posts: 61
M.O.C. #24321
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Quote:
Originally Posted by kenb
First, I very much appreciate this forum. We've had our Monty for about 5 months. You all have taught me so many great things as we get started in the RV world.
I put G rated all-steel belted tires on my Montana 2850FK. I checked the Monty's alloy wheel and the stamp says 110 lbs. I had four MasterTrack st235/80r16 UN-All Steel ST Trailer Radial Tires installed. Not sure how these compare to the Sailuns that you all talk about. So far I have put about 4300 miles on the the MasterTracks. They are rated to inflate at 110 lbs cold, but at that pressure they run 123 lbs hot. That pressure hot is probable ok for the wheels but I wanted to back down a little. I tried 103 lbs cold which yielded 113 lbs hot, and they were HOT to touch (because they flex more at the lower pressure and flex creates friction and heat). I settled on 107 lbs cold and they run about 115 hot with less heat than at the lower pressure. I am sure my experiment is affected by the heat of the pavement on a given day, but I tried to match conditions - mostly. With the sorry shape of the some of the highways I feel more comfortable with the steel belted G rated tires.
One more thought: I found that not all gas station air compressors can push 110 lbs. At one gas station I tried to put a little more air in my tires and it simply was not working. I discovered that my tires where pushing air into the gas station air tank - not good!
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I was wondering about how to get that kind of pressure. I'm looking at for a portable compressor that is suitable and won't take all day to get to 110#. ViAir has some offerings that might work but pricey. Any ideas?
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06-28-2019, 05:52 AM
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#16
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New Member
Join Date: Feb 2019
Location: Jefferson City
Posts: 5
M.O.C. #23549
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@penra. I go to the truck stops. Their repair shops have the higher pressure compressors. Some trucks stops also offer a diesel fill lane that also have an 'automatic' air fill service but I have not tried that service.
__________________
2017 Montana 3820FK, 2019 Ford F350 Diesel SRW, crew cab, long bed, 25k Companion Hitch, 400 watts solar, two 100Ah 12V LiFePO4 (Lithium Iron Phosphate) batteries.
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06-28-2019, 10:20 AM
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#17
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Montana Master
Join Date: Jan 2015
Location: Taylors
Posts: 562
M.O.C. #15948
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Quote:
Originally Posted by kenb
@penra. I go to the truck stops. Their repair shops have the higher pressure compressors. Some trucks stops also offer a diesel fill lane that also have an 'automatic' air fill service but I have not tried that service.
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Truckers tire inflation pressures are calculated differently than automotive tires. Our RV trailer tires require them to be in what is called a cold condition when inflated to their recommended cold PSI settings. That means they have been sitting for at least 3 hours. Any time a warm tire is inflated it needs to be adjusted/reinflated to the proper cold inflation PSI after it has sit for three hours.
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06-28-2019, 11:29 AM
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#18
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New Member
Join Date: Feb 2019
Location: Langley
Posts: 7
M.O.C. #23400
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Viair 400P RV
I use the Viair 400P RV and can get 110 psi with no problem and in a short time frame.
Keep an eye on Amazon prices as they have lowered the price at times.
Rick
__________________
2017 Montana 3000RE, Reese Sidewinder 19K King pin
2013 Ford F350 Short box
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07-07-2019, 06:47 AM
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#19
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Montana Master
Join Date: Oct 2015
Location: westminster md
Posts: 2,318
M.O.C. #17894
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fyi. my 2011 unit has 110 psi wheels on it.
__________________
2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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07-07-2019, 07:02 AM
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#20
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Quote:
Originally Posted by CalandLinda
Truckers tire inflation pressures are calculated differently than automotive tires. Our RV trailer tires require them to be in what is called a cold condition when inflated to their recommended cold PSI settings. That means they have been sitting for at least 3 hours. Any time a warm tire is inflated it needs to be adjusted/reinflated to the proper cold inflation PSI after it has sit for three hours.
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All tires should be inflated to the desired pressure while COLD. Makes no difference what the tire is on. Truck, trailer, motorcycle, kids bike, etc makes no difference.
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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