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05-28-2020, 03:29 PM
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#1
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Established Member
Join Date: Jun 2019
Location: Hope Valley
Posts: 24
M.O.C. #24270
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New Sailuns New Rims?
We have a 2016 Montana 3711 upgrading tires to Sailun 637 ST 235/80R.
Questioning if I should also upgrade stock rims because of increase in tire pressure. Haven’t gotten an answer from Keystone yet. Hope someone has info on this. Thanks!!
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05-28-2020, 03:57 PM
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#2
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 3,933
M.O.C. #20477
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Sam,
A 2016 should have 110 PSI rims. Crawl under it and look for the 110 stamp on the back side of the wheels to confirm.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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05-28-2020, 04:02 PM
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#3
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Montana Master
Join Date: Mar 2015
Location: Sequim
Posts: 527
M.O.C. #17176
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I agree I have a 2016 3720 with 110psi rims you should be ok check back of rim it should be stamped 110psi.
__________________
Dan & Sandy Huhn
2016 Montana 3720 2015 Chevy 3500 SWD Duro Max
Prev 2012 High Country 313RE 2012 Chevy 2500 DMax
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05-28-2020, 05:34 PM
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#4
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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Some 2010's have 110# rims and others don't, but after that they all do.
__________________
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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05-28-2020, 06:28 PM
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#5
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Established Member
Join Date: Jun 2019
Location: Hope Valley
Posts: 24
M.O.C. #24270
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Checked the rims and yes they are stamped 110.
Appreciate the feedback Thanks!!
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05-29-2020, 08:36 AM
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#6
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Montana Master
Join Date: Jun 2017
Location: POINTBLANK
Posts: 1,888
M.O.C. #19944
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Quote:
Originally Posted by dhuhn
I agree I have a 2016 3720 with 110psi rims you should be ok check back of rim it should be stamped 110psi.
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might not see stamp without pulling rim from hub
__________________
 RAM 22' DRW 3500 Crew LB 40 gal reserve tank / RETRAX Bed Cover / 2020 373RD HC / IS / MOPEKA Tank Monitor / Furrion Side&Rear Cameras
Slide Toppers / EMS-HW50C / Sailun 85's
3rd AC / Dometic 320
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06-10-2020, 04:21 PM
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#7
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Montana Master
Join Date: Jun 2017
Location: POINTBLANK
Posts: 1,888
M.O.C. #19944
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Quote:
Originally Posted by dhuhn
I agree I have a 2016 3720 with 110psi rims you should be ok check back of rim it should be stamped 110psi.
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Not entirely sure, but IMHO, I had to remove rime to see the 110 psi stamp on back side of wheel spook. I know my '17 305RL had 110 psi wheels and spare was a steel wheel (easily handle same). Another good give away to wheel rating is if the valve stem is steel.
__________________
RAM 22' DRW 3500 Crew LB 40 gal reserve tank / RETRAX Bed Cover / 2020 373RD HC / IS / MOPEKA Tank Monitor / Furrion Side&Rear Cameras
Slide Toppers / EMS-HW50C / Sailun 85's
3rd AC / Dometic 320
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05-29-2020, 01:04 AM
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#8
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Montana Master
Join Date: May 2017
Location: new caney
Posts: 1,050
M.O.C. #19873
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I would consider changing the rims only because two of the spoke style rims on my 2014 cracked and caused quick air loss. I know there are 1.000's of these rims on rv's but for me to have two on the same rv to crack were enough for me to change to aluminum modular wheels. These don't have the spokes so i would think they would be stronger though they are rated the same as factory wheels. Also Mobile Suites have the mod wheels and they weigh quite a bit more than our Montana's.
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05-29-2020, 08:02 AM
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#9
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Montana Fan
Join Date: Nov 2004
Location: Hudson
Posts: 480
M.O.C. #2446
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I purchased 4 new rims from wally world About 60 bucks each white spoke steel like what was on it then. when I purchased my Sailun tires. Mine were 80 psi rims. But my Monty is mega old and hardly used. Still haven't had it out yet during quarantine.
I also had a rim leak where the spoke was welded internally. Tire shop put in a tub of water and showed me the bubbles where the spoke met the outer rim.
__________________
Chris Donna and Oliver the rescue Dog.
Old 3255RL It is a weekend warrior and less than 15K miles. Mostly sits at the house. Home is where the heart is.
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06-10-2020, 03:49 PM
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#10
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Montana Master
Join Date: Aug 2015
Location: SWFL
Posts: 964
M.O.C. #17801
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My 2016 3711FL has 110psi wheels.
__________________
2016 Montana 3711FL
2005 Ford F350, 6.0 diesel, short bed
Demco Hitchiker Auto Slide hitch
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06-11-2020, 11:44 AM
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#11
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Established Member
Join Date: Dec 2016
Location: Sun City
Posts: 16
M.O.C. #19292
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Quote:
Originally Posted by Sam699
We have a 2016 Montana 3711 upgrading tires to Sailun 637 ST 235/80R.
Questioning if I should also upgrade stock rims because of increase in tire pressure. Haven’t gotten an answer from Keystone yet. Hope someone has info on this. Thanks!!
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We upgraded to the setup you reference about 1 1/2 years ago (2015 3610RL). I actually liked the style of the newer spoke mags so although pricey I ordered the tires and wheels from Keystone and had them shipped to my dealer. Had them take to a local tire shop and had them balanced and then installed. BTW don't forget the spare which I replaced also so the purchase was for 5 tires and wheels.
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06-11-2020, 12:47 PM
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#12
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Montana Master
Join Date: Sep 2017
Location: Tacoma
Posts: 1,567
M.O.C. #20475
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Your wheels should be good up to 110lb.
__________________
Bob & Carol Washington St
2017 HC HM352RL 2018 Dodge 3500 laramie CC LB 4x4
Curt Q25 with puck system, Factory air bags
Happy Trails 
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06-11-2020, 03:08 PM
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#13
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Montana Master
Join Date: Nov 2015
Location: Arlington
Posts: 1,522
M.O.C. #18081
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Even though our OEM rims were rated for 110psi when we upgraded our Sailuns we upgraded the wheels to take advantage of higher tire weight bearing rating.
3750 to 4200 per wheel
__________________
SOB
2015 Volvo VNL780 D13, iShift, 32k ET air hitch, Idle Free LiFePO4 APU
16.8KWhr LiFePO4, 2.52 kw solar, 10kva Victron split phase
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06-11-2020, 09:08 PM
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#14
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Montana Master
Join Date: Jan 2015
Location: Taylors
Posts: 562
M.O.C. #15948
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NOTE: You got 7000# vehicle certified axles? If so any rim that will withstand 110 PSI and provide 3500# of load capacity is acceptable.
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06-11-2020, 10:07 PM
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#15
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Montana Master
Join Date: Nov 2015
Location: Arlington
Posts: 1,522
M.O.C. #18081
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Quote:
Originally Posted by CalandLinda
NOTE: You got 7000# vehicle certified axles? If so any rim that will withstand 110 PSI and provide 3500# of load capacity is acceptable.
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Not me.
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06-13-2020, 03:59 PM
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#16
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Montana Master
Join Date: Jan 2009
Location: Centerville
Posts: 1,350
M.O.C. #9051
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Quote:
Originally Posted by PNW Fireguy
Even though our OEM rims were rated for 110psi when we upgraded our Sailuns we upgraded the wheels to take advantage of higher tire weight bearing rating.
3750 to 4200 per wheel
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Lets see if I got this right, we have wheels rated for 3750, covering axles that are rated for 7K, so far so good ? Thats 7500 we can go on those wheels. Now we put on G rated tires rated for 4040 or 4400, correct ? Now we go ,and put on a wheel rated for 4200, that the axles can't cover, only rated for 7K not 8400, plus we got a pin weight of at least 20%, even lowering the amount of weight even more on the tires ,and wheels. Maybe I missed something ? 
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06-23-2020, 06:44 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 PSFORD99
Lets see if I got this right, we have wheels rated for 3750, covering axles that are rated for 7K, so far so good ? Thats 7500 we can go on those wheels. Now we put on G rated tires rated for 4040 or 4400, correct ? Now we go ,and put on a wheel rated for 4200, that the axles can't cover, only rated for 7K not 8400, plus we got a pin weight of at least 20%, even lowering the amount of weight even more on the tires ,and wheels. Maybe I missed something ? |
The limiter is the GVWR. When using tires with more than 3500# of load capacity on 7000# axles the remainder is called "load capacity reserves". RVIA has insured, with their load capacity reserve recommendation for tires on RV trailers to be 10%; I've always recommended 12% - 15%.
RV trailer manufacturer's very seldom use axles with load capacities beyond the axles GAWR limit because it invites overloading.
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06-23-2020, 09:08 AM
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#18
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Montana Master
Join Date: Nov 2015
Location: Arlington
Posts: 1,522
M.O.C. #18081
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Quote:
Originally Posted by PSFORD99
Lets see if I got this right, we have wheels rated for 3750, covering axles that are rated for 7K, so far so good ? Thats 7500 we can go on those wheels. Now we put on G rated tires rated for 4040 or 4400, correct ? Now we go ,and put on a wheel rated for 4200, that the axles can't cover, only rated for 7K not 8400, plus we got a pin weight of at least 20%, even lowering the amount of weight even more on the tires ,and wheels. Maybe I missed something ? |
When I had IS installed we opted for 8k axles. Our Sailuns already had the rating to support this choice. I opted to change the wheels too. None of this changes the labeled GVW, however we are every pound of that weight.  That coupled with the previous suspension failure I experienced this was my choice. While the config mathematically supports more than what should be the weight of the trailer it supports the dynamic force changes exerted on the suspension. Think apparent vs true wind.
__________________
SOB
2015 Volvo VNL780 D13, iShift, 32k ET air hitch, Idle Free LiFePO4 APU
16.8KWhr LiFePO4, 2.52 kw solar, 10kva Victron split phase
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06-24-2020, 09:42 AM
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#19
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Montana Master
Join Date: Jan 2009
Location: Centerville
Posts: 1,350
M.O.C. #9051
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Quote:
Originally Posted by PNW Fireguy
When I had IS installed we opted for 8k axles. Our Sailuns already had the rating to support this choice. I opted to change the wheels too. None of this changes the labeled GVW, however we are every pound of that weight. That coupled with the previous suspension failure I experienced this was my choice. While the config mathematically supports more than what should be the weight of the trailer it supports the dynamic force changes exerted on the suspension. Think apparent vs true wind. |
Now that makes more sense, I see the reasoning, with 7K axles I could not.
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06-24-2020, 01:59 PM
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#20
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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 PNW Fireguy
I opted to change the wheels too. None of this changes the labeled GVW.,
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It also did not change the trailer's certified GVWR or GAWRs. Only the vehicle manufacturer or a certified vehicle modifier have that authority.
Replacement tires are selected to support the load capacity the OE tires supported. Therefor, they are not required to support the load of the individual axle's certified load capacity.
Tire load capacity reserves are figured from the vehicle certified GAWRs maximum load capacity.
(Example provided on request).
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