Go Back   Montana Owners Club - Keystone Montana 5th Wheel Forum > GENERAL DISCUSSIONS > TIRES, Montana Tires
Click Here to Login

Reply
 
Thread Tools Display Modes
 
Old 12-15-2019, 11:04 PM   #21
CalandLinda
Montana Fan
 
Join Date: Jan 2015
Location: Taylors
Posts: 159
M.O.C. #15948
Quote:
Originally Posted by laverdur View Post
I agree with rohrmann. I run my G614s at 110 psi. I get great wear and good fuel economy, considering the load. Any one who has upgraded from LR E tires to LR G tires should ignore the manufacturer's sticker on the RV. It will say 80 psi when it needs to be higher.
The sticker (federal certification label) has the minimum PSI setting for the Original Equipment tires. The minimum requirement for replacement tires is a PSI setting that will provide the load capacity the OE tires provided at vehicle manufacturer's recommended cold inflation PSI. All inflation pressures above that recommendation, up to and including tire sidewall MAX, are optional.
CalandLinda is offline   Reply With Quote
Old 12-16-2019, 08:57 AM   #22
goodellj
Seasoned Camper
 
Join Date: Sep 2017
Location: Newington
Posts: 66
M.O.C. #20452
Send a message via AIM to goodellj Send a message via MSN to goodellj Send a message via Yahoo to goodellj
I started with OEM E-rated tires and the inflation pressure on the sticker was 80psi. After installing a TPMS and several blowouts and complete tire changes, I finally wised up and got G-rated tires which on the sidewall called for 80-95psi. I knew I needed to use a higher cold inflation pressure but I was not sure how high to go. I decided on 90psi.

When you are rolling the tire pressures quickly rise by 5-10lbs, especially in warm temps. On a trip we would routinely be at 105psi, so I decided that these 5lbs weren't all that critical because the pressures rise anyway.
__________________
John & Janet from Connecticut
2012 Keystone Montana 3150RL
2012 Ford F350 Diesel 4x4 Lariat Crewcab SRW
goodellj is offline   Reply With Quote
Old 12-16-2019, 11:46 AM   #23
PSFORD99
Montana Master
 
Join Date: Jan 2009
Location: Centerville
Posts: 780
M.O.C. #9051
Quote:
Originally Posted by goodellj View Post
I started with OEM E-rated tires and the inflation pressure on the sticker was 80psi. After installing a TPMS and several blowouts and complete tire changes, I finally wised up and got G-rated tires which on the sidewall called for 80-95psi. I knew I needed to use a higher cold inflation pressure but I was not sure how high to go. I decided on 90psi.

When you are rolling the tire pressures quickly rise by 5-10lbs, especially in warm temps. On a trip we would routinely be at 105psi, so I decided that these 5lbs weren't all that critical because the pressures rise anyway.

I have to ask, what G rated tire did you buy that had 80-95 marked on the sidewall.
PSFORD99 is offline   Reply With Quote
Old 12-16-2019, 11:57 AM   #24
goodellj
Seasoned Camper
 
Join Date: Sep 2017
Location: Newington
Posts: 66
M.O.C. #20452
Send a message via AIM to goodellj Send a message via MSN to goodellj Send a message via Yahoo to goodellj
Gladiators. It also says they were made in China! They've been on the trailer for 3+ years and 29,440 miles. And they are showing very little signs of wear.
__________________
John & Janet from Connecticut
2012 Keystone Montana 3150RL
2012 Ford F350 Diesel 4x4 Lariat Crewcab SRW
goodellj is offline   Reply With Quote
Old 12-16-2019, 01:57 PM   #25
PSFORD99
Montana Master
 
Join Date: Jan 2009
Location: Centerville
Posts: 780
M.O.C. #9051
Quote:
Originally Posted by goodellj View Post
Gladiators. It also says they were made in China! They've been on the trailer for 3+ years and 29,440 miles. And they are showing very little signs of wear.
Gladiators, have heard of them ,just not that range of air pressure on G rated tires . Sounds like you are happy with them. Thanks
PSFORD99 is offline   Reply With Quote
Old 12-17-2019, 09:26 PM   #26
masterdrago
Montana Master
 
masterdrago's Avatar
 
Join Date: Sep 2017
Location: Willis
Posts: 643
M.O.C. #20587
So to follow up on this, has anyone figured out some sort of graph indicating a pressure temperature relation? So I get up to leave a campground and check all my tire pressures @80 degrees. Shows 100psi. When leaving the next campground the ambient temperature is 28 degrees. Should I now air up my tires to the sticker on the tire and tag on 5r? I know that my TV has a large swing of pressure during large swings in temperature. My tires usually run about 8-10 degrees over the ambient when driving based on my TPMS.
__________________
2018 Montana 3791RD
2017 Ram 3500 DRW 6.7 Cummins Aisin, B&W RVK3600
masterdrago is offline   Reply With Quote
Old 12-18-2019, 03:13 PM   #27
JABURKHOLDER
Montana Fan
 
JABURKHOLDER's Avatar
 
Join Date: May 2016
Location: Cuyahoga Falls
Posts: 491
M.O.C. #18572
masterdrago,

Thanks for your comment.

Moving forward, I do not have a temp/psi graph but letís make this even harder. One side of the RV is in the shade, one side is in the sun. The tires are covered, or not. One side of the RV has a slide that covers the tires.

Overthinking this whole process.

The morning of departure, regardless of any load or weather, I air my all RV tires to 105psi.

Again, firm believer in k.i.s.s.
JABURKHOLDER is offline   Reply With Quote
Old 12-18-2019, 06:49 PM   #28
masterdrago
Montana Master
 
masterdrago's Avatar
 
Join Date: Sep 2017
Location: Willis
Posts: 643
M.O.C. #20587
Quote:
Originally Posted by JABURKHOLDER View Post
masterdrago,

Thanks for your comment.

Moving forward, I do not have a temp/psi graph but letís make this even harder. One side of the RV is in the shade, one side is in the sun. The tires are covered, or not. One side of the RV has a slide that covers the tires.

Overthinking this whole process.

The morning of departure, regardless of any load or weather, I air my all RV tires to 105psi.

Again, firm believer in k.i.s.s.
Okay. So it's 57 here now all tire pressures are from 85-90psi. TPMS has to be quenched due to squealing that they are low. If I air to 105 now, how over-pressured will they be when the tire temp is 105. A good guess might be 109 if we read all the info on the newt correctly. I've found real life numbers much higher. As much as 128psi rolling in 95+ weather.
__________________
2018 Montana 3791RD
2017 Ram 3500 DRW 6.7 Cummins Aisin, B&W RVK3600
masterdrago is offline   Reply With Quote
Old 12-18-2019, 06:58 PM   #29
JABURKHOLDER
Montana Fan
 
JABURKHOLDER's Avatar
 
Join Date: May 2016
Location: Cuyahoga Falls
Posts: 491
M.O.C. #18572
All taken into account by the tire manufacturer when they determine the tireís max psi.

Youíll make yourself crazy thinking about all the what ifís.

Still, and always will believe in k.i.s.s.
JABURKHOLDER is offline   Reply With Quote
Old 12-18-2019, 07:39 PM   #30
laverdur
Montana Fan
 
Join Date: Nov 2011
Location: Albany
Posts: 180
M.O.C. #11972
As was previously stated, tire manufacturers take normal operating conditions into account when designing a tire and specifying the max inflation pressure. Some sources say that for every 10 degrees in temperature variation, you will see a 1-2 psi change in tire pressure. Altitude also affects tire pressure to the tune of about 2-3 psi per 5,000 feet elevation change. Sun on the road and the color of the pavement will also effect tire pressure. On a bright sunny day, a white/gray concrete road will not absorb as much heat as a blacktop road. The tires will pick up some of that heat from the roadway. I carry an infrared thermometer and during rest stops I check road temperature and tire temperatures. I also hub temperatures and disc/drum temperatures. It only takes a couple minutes to check all 8 wheels. Tires on the sunny side of the rig will be warmer than those on the shady side. Proper tire inflation will ensure that the tire is running as cool as it can under the prevailing driving conditions. A cooler tire has less temperature rise. I have started towing days on a valley floor of 1,000 feet at 55 degrees. During the day I would experience temperatures up to 100 degrees and I would have elevation changes of up to 7,500 feet. My TPMS has never screamed at me for tires being over temperature or over pressure and I it set to be more sensitive than the default settings. I stick with 110 psi and I've had good luck for over 80,000 miles.
__________________
2012 3150RL. G614 tires. Hardwired surge protector. Level-Up Hydraulic leveling.
2013 F-350 Lariat 6.7 PSD SRW SC LB 4X4 OEM hitch, air self-leveling on rear. 57-gallon replacement fuel tank.
laverdur is offline   Reply With Quote
Old 12-18-2019, 07:46 PM   #31
mhs4771
Montana Master
 
mhs4771's Avatar
 
Join Date: Dec 2009
Location: Sebring
Posts: 2,591
M.O.C. #9969
All I know is that the Max Inflation Pressure on the Sidewall is taken at 70 degrees F
__________________
Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.
mhs4771 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Powered by vBadvanced CMPS v3.2.3
Disclaimer:

This website is not affiliated with or endorsed by Montana RV, Keystone RV Company or any of its affiliates. This is an independent, unofficial site.


All times are GMT -6. The time now is 01:43 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
×