Tire pressure

[Keith Schweizer]

I just replaced my GY marabombs after one failed on a short trip home after a weekend outing. I was lucky as the tire was still loosing air as I backed my trailer into the garage. Steel belts showing and starting to fray yet no damage other than a small chip from the tire skirt.
I put the G614's on and wondering if I should run them with the max 110 psi? I have a 09 2955rl so not as heavy as some of the larger monty's out there. I have 100 lbs in now and the ride feels pretty good. A much nicer ride than the other tires( 9700 miles on them when it failed)

[DQDick]

Check the Goodyear site for their recommendation for your weight and decide. For gas mileage as much as weight I run mine at about 108#.

[NCFischers]

If you have TR6 rims on your 09 rig, they are not rated for tire pressures over 80#.

[DQDick]

Good point, I missed the age of the rig.

[mach111]

Originally posted by NCFischers

If you have TR6 rims on your 09 rig, they are not rated for tire pressures over 80#.


Keith, I have a 09 2980RL. I have spoken with Tredit tech directly and was advised do NOT exceed 80lbs with the TR-6 factory rims. A lot of discussion has been circulated about these rims. After weighing my unit I found the heaviest wheel weight was 2240 on RF. I have Michelins XPS Ribs and air to 80 lbs. IMP why have the G614 and can only air to 80lbs. due to rims. Everyone will not agree with this but I feel safe and not putting anyone in danger with our rig.

[bncinwv]

Since it appears you already have the 614's mounted, and as already stated may have rims that are not sufficient for the higher pressure, it appears you need to do some investigating. The first thing is to find out what you do have in terms of the rims. Tredit.com is the website where they show the rims that are supplied and the weight ratings for the respective rims. See what you have and see if they are rated for 3200 pounds or 3750 pounds. If they are rated for 3200 pounds, then my understanding is you are limited to 80 psi which on your 614's would provide 3042 pounds per tire. You may also want to contact Tredit directly for confirmation. This is barely sufficient considering your loaded rig weight appears to be 13,715. Your pin weight will be the deciding factor as to whether this weight capacity is sufficient for your rig. It may be a better alternative to see if Tredit or another supplier can give you a deal on some 110 psi rated rims and go ahead and bite the bullet and make the swap. You do have some research to do before you can decide what pressure you can safely use.
Bingo

[Captain Joe]

I agree, you may have to purchase rims that will handle 110 psi. Now, to answer your question, I run my G614s at 105 psi. Why? Because if you read the instructions on tire gauges, you will see that they are +/- 3 psi. I do not know if mine is + or -, so I fill at 105psi. I would rather be a little under than over. Good luck

[vangoes]

The rims should also be stamped on the inside as to what PSI pressure they are rated. Crawl under and look around....the stamping is usually easy to see.

[dieselguy]

I propose Keith weigh his 2955 for starters. On the shorter rigs, you'll most always have minimally 2000# pin weight with any personal gear loaded in . I don't know his situation, but not all of us full time / long time. Our typical "loaded" rig is no where close to what the max weight number is on the Montana spec sheet as we don't haul near as much "stuff". Assuming he got his guidance from this forum ... perhaps this is one example where the seemingly blanket recommendation of G614's was in error. I know I seem abrasive on my replies, but the ones that ususally chime in with answers seem to assume we all travel loaded to the gills!

[Art-n-Marge]

I thought a reputable tire dealer would check to ensure a properly rated tire is on a properly rated rim. I've never seen any tire tech check for that, so while you hope it happens, I'm not sure it does. Long ago, a tire tech mounted a tire on my vehicle and forgot to put the drum brake back on. Fortunately, I was there and pointed it out, so who knows if this would have been caught. I try to be present for all work done. Obviously you can imagine my concern, when I have to hand the keys to a dealer and trust what happens to it as it gets driving back into the service bays.

The tire tech should be able to check this, but if it were me, I would have mentioned that a tire rating up to 110psi was going on a wheel that might not support that psi - I don't know if the OP knew about this, I'm guessing not. I would then think the tech could locate the wheel rating or at least look into it to verify.

We are not all infallible, except maybe Ozz... well, at least he's darn close to perfect. I like to think he only screws up on purpose, to seem normal.

[mach111]

My TR-6 rims are stamped 3500 lbs max load. Are TR-6 rims rated at different load ratings for these years manufactured? I am reading 3000, 3200, 3750. No wonder us Monty owners are confused with all these different ratings.

[Mudchief]

I have the G614 0n the TR-6 rims. Based on the goodyear site I only need to run 80 pounds in them based on my weight. I have been running them at 90 pounds for over 15K miles. The 110 pounds is only needed if you are carrying 3750 pounds on that tire.

[Keith Schweizer]

Wow! Thanks to everyone for all the info. It looks like I have some homework to do. i will be crawling under my monty to check out the rim rating. I purchased the tires from camping world. The tech who removed the tires never said anything about the rim rating.CW was shorthanded the day I replaced the tires so they sent the tires out to be changed out from a local tire dealer I guess. The tech commented that with the nice rims i had CW did not want to scratch them up with their equipment. The ride home was pretty rough so i checked pressure and tires were set at 120 lbs. I knew that was way too much so I dropped the to pressure as noted above.

[dsprik]

My steel rims are stamped Max Load 3750#. Build date of this 2007 3400 was July 20th, 2006. Does this mean I can run the G614s at 120#? And is it even necessary with my 6K axles?

[bncinwv]

Dave,
614's are rated at 3750 pounds at 110 psi. 120 psi is over-inflating them. They are probably overkill for your rig with 6000 pound axles, unless you are interested in a very big safety margin.
Bingo

[dsprik]

Not really, Bingo... I read "very big safety margin" as "very expensive". I want to be safe, but if I win the lottery... But what you are telling me is that I can run 110# on those rims? Because I was concerned, being right at the cutoff/switchover to the newer rims and the 7K axles, that I might have rims that might be rated at the lower end. I'm glad to learn that 3750# rims can handle a 110# rated tire.

[bncinwv]

The steel rims have always been rated at 3750 pounds and 110 psi as far as I know, I think this was documented way back when I was using the forum for research on our first Montana. There was some wishy-washy business with the alloy rims around that time (2007-2009), first they were said to be okay for 110 psi and stickers were supplied to that effect to be put on those rims, then they retracted the 110 psi rating and reverted back to the 80 psi ratings. This did not include the steel rims.
Bingo

[dsprik]

Thanks, Bingo. I remember the general conversation on the re-rating of the rims during that time. Just couldn't remember what was said about the steel rims....