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Old 09-09-2011, 12:53 PM   #41
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Originally Posted by Labzy View Post
Thanks Scott

But I have yet another question now.......
How much do I lose from the load rating at 35psi?
Do you guys not add a few more pounds when you tow? (like up to 38psi?)
I have the same tires and I have been running 37 lbs in them all the time.It seems to take the sloshyness out of them.Any more and the bumps are very noticeable.
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Old 09-09-2011, 01:48 PM   #42
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Originally Posted by boubou View Post
Goodyear p275/60/R20
Max weight 2601 lbs
Max Weight of 2601 is a Load Range 114 tire.
In fact it is a 114S from the Goodyear web site.
Speed Range S equals 112 MPH.
With that basic information we are NOT done.

It must be inflated to its maximum inflation pressure cold of 44 PSI to carry that load. HOWEVER, when Passenger car tires are used on trucks and SUVs they REDUCE the maximum allowable load on the tire by a factor of 1.1; thus the maximum allowable inflation pressure is 35 PSI which equates to a maximum load of 2365 pounds not 2601. (see page L-10 of the Goodyear load and inflation pressure manual.)

The Door post is a manufacturers recommendation for inflation that takes into consideration several factors in addition to maximum load. While the door post PSI will NEVER be higher than the maximum load bearing pressure; is almost always less. Sometimes a LOT less. That pressure is based primarily on RIDE factors (braking, cornering, and vehicle roll) at the curb weight of the vehicle and the OEM tires.

http://hmcclub.homestead.com/Goodyea...oad_Charts.pdf

The single exception to the above has to do with P tires that are branded XL. In this case the following "note" applies (taken from the Tire Specification" document below).

The load-carrying capacity of P-Metric tires is rated either Standard Load or Extra Load. The load that can be carried with a maximum inflation pressure of 35psi limits standard Load tires. The load that can be carried with a maximum inflation pressure of 41 psi limits extra Load tires. An Extra Load tire (for example P235/75R15XL) will be branded with “Extra Load” as shown in the photo on this page. A Standard Load tire does not bear any special designations.

References:
http://www.cjtire.com/pdf/Tire%20Identification.pdf
Wrangler SR-A
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Old 09-09-2011, 03:20 PM   #43
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Lou, I am not asking Google anymore, you get to the point a lot quicker! Thanks for the info, it will come in handy.
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Old 09-09-2011, 08:56 PM   #44
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Originally Posted by herk7769 View Post

It must be inflated to its maximum inflation pressure cold of 44 PSI to carry that load. HOWEVER, when Passenger car tires are used on trucks and SUVs they REDUCE the maximum allowable load on the tire by a factor of 1.1; thus the maximum allowable inflation pressure is 35 PSI which equates to a maximum load of 2365 pounds not 2601. (see page L-10 of the Goodyear load and inflation pressure manual.)

The Door post is a manufacturers recommendation for inflation that takes into consideration several factors in addition to maximum load. While the door post PSI will NEVER be higher than the maximum load bearing pressure; is almost always less. Sometimes a LOT less. That pressure is based primarily on RIDE factors (braking, cornering, and vehicle roll) at the curb weight of the vehicle and the OEM tires.

Now that's what I'm talking about!!!!

~Thanks Lou
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Old 09-11-2011, 06:44 PM   #45
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Originally Posted by herk7769 View Post
Max Weight of 2601 is a Load Range 114 tire.
In fact it is a 114S from the Goodyear web site.
Speed Range S equals 112 MPH.
With that basic information we are NOT done.

It must be inflated to its maximum inflation pressure cold of 44 PSI to carry that load. HOWEVER, when Passenger car tires are used on trucks and SUVs they REDUCE the maximum allowable load on the tire by a factor of 1.1; thus the maximum allowable inflation pressure is 35 PSI which equates to a maximum load of 2365 pounds not 2601. (see page L-10 of the Goodyear load and inflation pressure manual.)

The Door post is a manufacturers recommendation for inflation that takes into consideration several factors in addition to maximum load. While the door post PSI will NEVER be higher than the maximum load bearing pressure; is almost always less. Sometimes a LOT less. That pressure is based primarily on RIDE factors (braking, cornering, and vehicle roll) at the curb weight of the vehicle and the OEM tires.

http://hmcclub.homestead.com/Goodyea...oad_Charts.pdf

The single exception to the above has to do with P tires that are branded XL. In this case the following "note" applies (taken from the Tire Specification" document below).

The load-carrying capacity of P-Metric tires is rated either Standard Load or Extra Load. The load that can be carried with a maximum inflation pressure of 35psi limits standard Load tires. The load that can be carried with a maximum inflation pressure of 41 psi limits extra Load tires. An Extra Load tire (for example P235/75R15XL) will be branded with “Extra Load” as shown in the photo on this page. A Standard Load tire does not bear any special designations.

References:
http://www.cjtire.com/pdf/Tire%20Identification.pdf
Wrangler SR-A
Herk Why is the maximum load of a passenger tire reduced when used on a truck.If it is rated to carry a certain amount of weight,wouldn't it carry the same amount no matter what it was on?
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Old 09-11-2011, 06:52 PM   #46
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Lou, I am not asking Google anymore, you get to the point a lot quicker! Thanks for the info, it will come in handy.



I know what you're saying. If I need to find anything out I just "Lou it" now rather than Google it.
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Old 09-11-2011, 08:29 PM   #47
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http://www.cjtire.com/pdf/Replacement%20Tires.pdf

I yield to the Goodyear engineers here.
This document seems to sum up the logic though.
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Old 09-11-2011, 08:51 PM   #48
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Interesting,Thanks for the info.
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Old 09-11-2011, 09:42 PM   #49
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Interesting,Thanks for the info.
A trip to the tire store in your future?
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Old 09-12-2011, 04:15 AM   #50
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Tires have 47000 kms on them so they have to soon be replaced anyway,already had plans to get a Michelin LT tire to replace them.I had them on my other truck and got 90000 kms out of them.
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