Tire Pressure

Vicr · 07-30-2016, 05:44 PM

While driving home from the dealer and out on our first and second trip the coach was a real PITA to drive. My 150 PSI tire pressure gauge finally arrived from Amazon and I only had 87.5 lbs. of pressure in the tires. I was talking to Jeff who owns Cascade Custom Coach in Sultan, WA and explained the problems and the first question he had for me was the tire pressure. When I told him he said that's like driving on flat tires you need to inflate them to the maximum cold pressure. I fired up the compressor and was able to get 108 lbs in the fronts and outside rears. I took the coach to a local tire shop that also works on large trucks to have the air the back inside tire and because of the stupid angle on the valve stems they weren't able to get an air chuck on the stem and suggested to get the valve stems replaced which I am going to do. Out on the first trip after getting 4 out of 6 tires inflated it was like driving a different coach! Strait down the road no wandering and easy to drive. Next stop is have the valve stems replaced and get those aired up as well.

Grumpy · 07-30-2016, 05:53 PM

Also take it to a CAT scale to get weights. You were under inflated, but you may not need 150 lbs. Compare your weights to a tire pressure chart.

Vicr · 07-30-2016, 05:55 PM

Tires are rated at 110 cold and I have them at 108.

Arniesports60 · 07-30-2016, 07:00 PM

On our Precept 31ul, the chart next to the driver seat has
suggested 83 psi. I find that too low. My friend who owns
a car/rv shop said to get maximum life of tires inflate them
closer to recommended tire pressure (i.e. 100psi).

I run mine around 93 psi as a compromise between
the rv's info and the tire's info. Seems to give me
a good handling ride.

Grumpy · 07-30-2016, 07:19 PM

Quote:

Originally Posted by Vicr

Tires are rated at 110 cold and I have them at 108.

Misread the 150, but as Arniesport said you may not even need 110. When we had our SENECA tires were rated at 110, scaled it and according to MICHELIN'S chart I only needed 9O rear 85 front, Door sticker said 95 all around.

abarkl · 07-30-2016, 07:31 PM

Quote:

Originally Posted by Arniesports60

On our Precept 31ul, the chart next to the driver seat has
suggested 83 psi. I find that too low. My friend who owns
a car/rv shop said to get maximum life of tires inflate them
closer to recommended tire pressure (i.e. 100psi).

I run mine around 93 psi as a compromise between
the rv's info and the tire's info. Seems to give me
a good handling ride.

I have found over the years that my RV tires will start to rot and most recommendations of 7-10 year age replacement for safety, the tires will never need to be replaced because of wear unless it's unusual wear, but from age instead.

Djtommysr · 08-01-2016, 06:27 PM

You don't need to replace the tire valves just go to an auto parts store and buy valve stem extenders. They come in all sizes and angles, made out of metal and will do the job.

Vicr · 08-01-2016, 06:51 PM

The valve stems I have are not pointed toward the hole in the outside rim so they would extend closer to the outside rim. the stems have a 15 degree bend in thme and we couldnt, as I explained, even get a 90 degree chuck onto the valve stem. They will be replaced with strait valve stems that points toward the hole in the outside rime where I can the air them up with my 8" strait air chuck.

McGarrett50 · 08-09-2016, 05:28 AM

Ran at recommended pressure on sticker inside (83 PSI) for a year or so. Went to commercial Goodyear dealer to have tires rotated and who also recommended running at or near top of cold PSI (110) ON the tire. Have been running at or near that since. Ride is much better for us as well. One front tire had shown some wear (probably due to misalignment). That's on the back now. BTW, inside tires on back do not rotate. Back tires should not get out of alignment as they just follow.

Also, the valve extenders were the first thing I had added to our 2015 31UL when we bought 2 years ago. Money very well spent as there is NO way to get to OEM valves on the outside tires (at least with the 2015 hubcaps).

Arniesports60 · 08-09-2016, 10:02 AM

We run our tires at 95

Though unto shop owner told me to get longest wear
For your tires set them to what's listed on the tire itself
(I.e. 110).

The exact pressure is based on each persons comfort.
More pressure can make for a firmer or harder ride

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