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 > How much air in tires?

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Nosmo King

Hobart, In

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Posted: 05/13/02 10:38pm Link  |  Print  |  Notify Moderator

Just purchased 6 brand new Goodyear G159 load range F tires for my MH. Sidewall calls for 110# maximum pressure. Rims are stamped for maximum of 95#. Will not exceed recommended rim pressure, as I think that is more critical than tire recommendations, (I think). Was thinking about in the area of cold pressure 90# front and 85# on dual rears. Will I be damaging tires by keeping them a bit underinflated as indicated on side of tire?


Dick and Marie 1984 Coachman 30ft. SENATOR
454 CHEVY Hobart, Indiana







John Wayne

Long Beach, Ca

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Posted: 05/13/02 11:22pm Link  |  Print  |  Notify Moderator

I would weigh the unit loaded for travel, weigh frt.axle then rear axle. Go to Goodyears web site get inflation guide for brand and size of tire and inflate to there specs.based on weigh the axles are carring. Mine takes less air in frt. tires and more in rears.


John & Carol Life members
01 31'Sea View single slide, F53 V-10
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LVJ58

Las Vegas, Nevada

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Posted: 05/13/02 11:57pm Link  |  Print  |  Notify Moderator

Using Goodyear's inflation guide, with a 30' coach you should be able to safely operate your coach with 70psi in your tires. In single configuration (front tires) at 70psi each tire is rated to support 3,640lbs of vehicle weight each so x 2 = 7,280 lbs. The front weight on your coach (you should weigh it) will probably be below 7,000lbs. In dual configuration (rear drive wheels) at 70psi each tire is rated to support 3,415 each x 4 = 13,660lbs. So with 70psi in all 6 tires they are capable of supporting 20,940lbs which is most likely in excess of the GVWR of your coach.

Good luck and safe travels, C. Jim

P.S. I run 70psi in all 8 tires on my coach (it has tags). My loaded travel weight is 20,300lbs and the coach has a 22,000 GVWR.


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: 05/14/02 01:49am Link  |  Print  |  Notify Moderator

Dick I have the same tyres and but couldn't find a site that had the inflation info I wanted. Wrote to Goodyear and the following letter helped me out.

QUOTE "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"UNQUOTE


*This Message was edited on 14-May-02 01:54 AM by R2*



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

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