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 > Help - tire pressure

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jerry11351

Charlotte, N.C.

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Joined: 03/09/2002

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Posted: 06/02/02 09:31am Link  |  Print  |  Notify Moderator

We recently purchased a 2002 Winnebago Adventurer 35U. It came with Goodyear tires. For tire pressure, the owner's manual says to use the pressure as noted on the card posted on the driver's door. That card says to use 80 psi on the front tires and 85 on the rear- no mention of different tire pressures based on weights carried per axle or wheel. The maximum tire pressure noted on the tires is 100 psi.

I have read on many posts on this forum that the tire pressure to be used should be based on the weight on each axle or wheel. There was no chart included in my package of information which came with the RV showing various tire pressures for various weights carried.

When you purchase a new Winnebago, they give you one year free Premium Roadside Assistance which includes access to their technicians for answering technical questions. I called them, and they said to put 90 psi in all tires. He said the psi noted on the card (80 front and 85 rear)would be for maximum comfort, the psi noted on the tire itself (100 psi) would be for maximum tire wear and longevity. He recommended going in the middle (90 psi).

Any recommendations or thoughts?

LVJ58

Las Vegas, Nevada

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Posted: 06/02/02 09:58am Link  |  Print  |  Notify Moderator

Hi Jerry,

You didn't mention if your coach was built on the Ford or Workhorse chassis, or your tire size. Our 2000 coach is on the Ford chassis with the Goodyear G-159 245x70R19.5. Our coach has tags so it has 8 wheels. Fully loaded for travel with full fuel and fresh water tank it weighs 20,300lbs. Using the Goodyear tire pressure chart, I can safely operate with a tire pressure of 70psi, I run 72psi. Additionally, after driving for a 100 miles or so and make a rest stop I place my hand against the tire sidewall to check for excessive heat. So far running at the 72psi, I can hold my hand on the sidewall which is hot, but not such that I can't hold my hand on it for 15 seconds or more. Without question, higher tire pressure is better for tire mileage, but on some chassis, may give you a very rough ride. Personally, if it's on the Ford chassis, I wouldn't run with more than 80psi, but most important is to weigh your coach then using the tire pressure chart inflate your tires to the pressure required to support the weight. If your coach is on the Workhorse chassis with the 22.5 tire, then the 80/85psi recommended by the coach manufacturer sounds right and 90psi wouldn't hurt anything.

Good Luck, C. Jim


Jim & Sherry Seward
Las Vegas, NV
2000 Residency 3790 V-10 w/tags & Banks System
2003 Suzuki XL/7 toad

R2

Victoria, BC, CANADA

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Posted: 06/02/02 11:51am Link  |  Print  |  Notify Moderator

My Triple E Commander has 245/70R 19.5 Load Range F GoodYear tyres. I
contacted GoodYear and this is their reply and inflation chart. Hope this
helps.

Rob

I would suspect that you have load range F 245/70R19.5 tires on your
vehicle, while the 265/70R19.5 is a load range G size. The difference
is close to 1000 lb extra carrying capacity per tire, which would explain
the discrepancy in inflation pressures between these two dimensionally
similar tires.

You can definitely run your tires at an inflation pressure less than 85 psi
if you are not loaded to the maximum capacity. You can use the chart below
to determine your optimum inflation pressure. We do not recommend going
below 70 psi with this tire, however.


|----------+--------+--------+--------+--------+--------+--------+--------|
|psi |70 |75 |80 |85 |90 |95 |100 |
|----------+--------+--------+--------+--------+--------+--------+--------|
|dual load |3415 |3515 |3655 |3875(F) |3940 |4075 |4375(G) |
|lbs | | | | | | | |
|----------+--------+--------+--------+--------+--------+--------+--------|
|single |3640 |3740 |3890 |4080(F) |4190 |4335 |4545(G) |
|load lbs | | | | | | | |
|----------+--------+--------+--------+--------+--------+--------+--------|



We suggest having your loaded RV weighed at a location with the capability
to determine the actual max loading on each axle position.
Then inflate all tires on that axle to the inflation pressure needed for
that max loading. Many recreational vehicles are designed with a weight bias
front-back or side-to-side that may put unequal loading on one or more
tires.

Please feel free to contact me with any additional questions you may have.

Regards,
Janice Consolacion
Product Manager, Commercial Tires
The Goodyear Tire & Rubber Company



Rob & Sue & Merlin (Lhasa Apso)
1999 V10 TRIPLE E COMMANDER
2000 HONDA CIVIC toad

John Wayne

Long Beach, Ca

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Joined: 02/13/2001

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Posted: 06/02/02 01:48pm Link  |  Print  |  Notify Moderator

You can go to the goodyear web site, look up your tire size and they will have an inflation guide for that size tire. Then weigh your veh. and inflate to that weigh.


John & Carol Life members
01 31'Sea View single slide, F53 V-10
96 Toyota 4-Runner auto 4x4 (Remco, M&G brake system)
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God Bless

KF6HCH


Don Savannah, GA

Savannah, GA US

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Good Sam RV Club Member

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Posted: 06/02/02 03:06pm Link  |  Print  |  Notify Moderator

The tire pressure on the Winne door tag is based on what they predict you will weigh and the tires as supplied, in general that will keep you out of trouble.
The only way to know for sure is to get it weighed in all 4 locations, then select front tire pressure based on the heaviest front location, then select the rear tire pressure based on the heaviest rear location. Add about 10% to each weighed location to allow for future additional loads.
The door sticker on mine suggests 70psi, but I had mine weighed and now run 75psi in front and 70psi in the rear.


Don Harris, Savannah, GA
1999 Winnebago Adventurer, 35C, Class A, Ford V10, 20,500 GVWR chassis. 1995 Saturn SW2 Toad, Blue Ox Aventa towing system, SMI Toad brake.

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