Goodyear tires - BAD

[Don Bradner]

It is overinflated if it has more pressure than the manufacturer calls for,
cold, at its carrying weight.

A radial is designed to have specific sidewall flex, and an overinflated tire
will not flex correctly.

For the tires in question, 130psi is designed to carry 9090 lbs on a single
tire, or 8270 lbs when part of a dual.

At 85psi (the lowest recommended pressure for this tire) it will carry 6415 lbs
single and 5840 for a dual.

The complete inflation table for RV tires at Goodyear is found at
http://www.goodyear.com/rv/pdf/rv_inflation.pdf

The recommendation from Goodyear is "Determine the heaviest end of each axle and
use that load to select the inflation pressure for all tires on that axle.Refer
to the appropriate Goodyear load and inflation table and select the inflation
pressure for the load that is nearest to, but not less than, the load you
measured"

Michelin tables are found here:
http://www.michelinrvtires.com/michelinr...les.j\
sp - on all tires I've compared Goodyear and Michelin have the same PSI values.



On 7/3/2009 at 2:07 PM RWW wrote:

>Is a tire inflated to it's max pressure 'overinflated'??
>
>Roger Webb
>91 WL
>Cedar Rapids, IA
>
>RWW
>
>On Jul 3, 2009, at 11:00 AM, "Don Bradner"
>wrote:
>
>>
>>
>> A quote from one of many articles on the topic: "An overinflated
>> tire is stiff and unyielding and the size of its footprint in
>> contact with the road is reduced. If a vehicle's tires are
>> overinflated by 6 psi, they could be damaged more easily when
>> encountering potholes or debris in the road, as well as experience
>> irregular tread wear."
>>
>> The 6 psi was in reference to a car tire - equivalent to something
>> like 20-25psi in our big tires.
>>
>> Since the proper inflation of a 315/80R22.5 could be as low as 85
>> (typical tag axle) or 90 (typical drivers), going to 130 is 40 to 45
>> lbs too high!
>>
>> On 7/3/2009 at 7:11 AM RWW wrote:
>>
>> >This statement confuses me ...
>> >
>> >... there are those who just go to the max. That would probably be
>> >over the proper (way over for some tire positions) level.
>> >
>> >I have always believed that as tire pressure is increased (up to the
>> >max PSI) you increase load capacity and decrease ride quality. In
>> >other words, having your tires above the PSI 'needed' for the weight
>> >at that position (but not above the max) will NOT increase the
>> >probability of tire failure. However, you do sacrifice ride quality.
>> >
>> >Roger Webb
>> >91 WL
>> >Cedar Rapids, IA
>> >
>> >
>> >On Jul 2, 2009, at 11:33 PM, "Don Bradner"
>>
>> >wrote:
>> >
>> >> of 130 psi, and there are those who just go to the max. That would
>> >> probably be over the proper (way over for some tire positions)
>> level.
>>
>>