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Old 07-24-2020, 03:00 PM   #1
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Tire pressure question on my new to me coach

Question, again.
I have recently purchased 2008 Holiday Rambler 40SKQ and have a question about proper tire pressure. The coach came with 275/80/22.5 on it from the factory, and I know that you are supposed to run what the coach manufacturer indicates on the sticker inside for recommended air pressure. Done that for years on my prior gasser coach, always worked well. But the prior owner of my new coach upgraded to 295/80/22.5. I was wondering with the increase in tire size, do I follow whats on the tire, use the factory numbers, or ???


thank you for your advise

Steve
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Old 07-24-2020, 03:06 PM   #2
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The absolute best is to have it weighed. Use the tire pressures listed in the guide from the specific tire mfg. for the weight that the tire is supporting. Fronts will be a little higher than the rears.
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Old 07-24-2020, 03:06 PM   #3
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Quote:
Originally Posted by laveydude26 View Post
I know that you are supposed to run what the coach manufacturer indicates on the sticker inside for recommended air pressure.

Steve

That is NOT correct unless your axles are loaded to their GAWR. THAT is what the PSI on the GVWR sticker indicates-- correct minimum PSI if each axle is loaded to its GAWR.


Hopefully, you will be well under GAWR/have some safety reserve.


Best answer is to have each wheel position weighted. Take the heavier wheel position on each axle and go to the Inflation Table for your new/295 tires to determine the correct minimum PSI.


Next best and a lot easier is to just get axle weights (most truck stops) and do the same. But you will need to add a "fudge factor" to account for left/right imbalance.
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Old 07-24-2020, 03:12 PM   #4
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Depending on MFG the 275's load capacities at 120 psi are 6600 lbs each tire. The 295' depending on MFG capacities are up to 7830 lbs per tire. You can run a lower tire pressure, within reason, and carry the same weight for a smother ride. That would be my guess
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Old 07-25-2020, 03:52 AM   #5
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CAT Scale – Network of Certified Truck Scales. has examples and locations to weigh...
good luck
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Old 07-25-2020, 08:38 AM   #6
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I also highly recommend periodically weighing your RV. We do not full-time, but on occasion, we will take longer trips (4-6 weeks). Depending on trip timing and itinerary, packing/loading needs are different. So I use the CAT Scale app "Weigh My Truck". It's extremely easy to use, and it has its own YouTube video on the weighing process. There are also other videos regarding the app as well. CAT Scales are available for your use at truck stops across the country, and as I recall the cost is only around $12-$13 and is well worth it. Also, if you have the opportunity to attend a GS/iRV2/FMCA or other rally, there are opportunities periodically to have your RV 4-Corner weighed to allow you to see how your axle weight is biased one side to the other. Anything you can do to understand weight and loading, the safer your travels will be.
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Old 07-25-2020, 08:48 AM   #7
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Quote:
Originally Posted by Rodg495 View Post
The absolute best is to have it weighed. Use the tire pressures listed in the guide from the specific tire mfg. for the weight that the tire is supporting. Fronts will be a little higher than the rears.
Do this.

Get the coach weighed with the tanks full, all your gear on board, and the usual number of people sitting in their seats.

Using the actual weight for each axle AS YOU WILL BE GOING DOWN THE ROAD, refer to the tire manufacturer's load & inflation charts and select the appropriate weight. It's allowable to go over the table but never lower than the listed pressure for your weight. No need to go to the max though, unless you enjoy a harsh ride, poor handling, and reduced braking.

Most will recommend a small buffer to account for the day-to-day fluctuations in weight and the daily changes in temperature.
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