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Old 07-03-2012, 10:19 AM   #1
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Tire charts

I want to weigh my rig and determine proper tire pressure per axle/wheel. Everyone says weigh the rig on all four corners and then consult the tire charts for proper inflation.
Ok, where do I find the charts? I've been on BFG's website and can't find it. Is this a generic one-size-fits-all chart or specific to manufacturer? I have load range E BFG Commercial T/A all season tires.
Any help deciphering all this is appreciated.
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Old 07-03-2012, 12:01 PM   #2
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What size are your tires?
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Old 07-03-2012, 01:17 PM   #3
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Typically you have to go to the truck tire site rather than the general passenger car site - most companies have them separate.

The BF Goodrich truck tire charts can be found here:

BFGoodrich®Americas Truck Tires Reference Materials Page

but if your tires are less than 19.5" diameter they won't be in there.
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Old 07-03-2012, 03:03 PM   #4
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http://hmcclub.homestead.com/Goodyea...oad_Charts.pdf
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Old 07-03-2012, 05:28 PM   #5
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The tire size is 225/75R16.
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Old 07-03-2012, 05:37 PM   #6
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@tombstone - thanks, that looks like what I need. I presume manufacturer specs are pretty much all the same?
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Old 07-04-2012, 07:15 PM   #7
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Odds are that inflation specs for another tire of the same are fairly close, but assuming they are identical is a risky proposition. I would err on the side of caution and go to a higher pressure for the load. There is no such thing as a standard load rating for a tire of a given size, nor a standard inflation pressure for a given load.

A Goodrich dealer should have the correct infaltion table for your tire - call and ask.
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Old 07-05-2012, 10:02 AM   #8
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Thanks all for the replies. I got weighed yesterday, front axle 3620, rear axle 8680. We're about 1750 lbs under the gvwr, this is with a full water tank, full gas tank and all the gear we usually haul with.
Based on the Goodyear chart I can reduce tire pressures a bit, to ~55lbs front, ~70lbs on the rears. I will check with Goodrich though.
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Old 07-06-2012, 01:45 AM   #9
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If the tires are the correct load rating for your vehicle then put them at the maximum PSI shown on the sidewall and monitor wear over time. After a thousand miles it will be easy to see if they are over or under inflated and it will affect only 2% of the tread life overall.

The load charts from the tire manufacturers provide the MINIMUM air pressure for a given load and that is not the same as the OPTIMUM air pressure for the tire on your vehicle. The vehicle manufacturer has a much better idea of the total load and the pressure needed for the tires to function safely and it is best to follow their recommended tire pressures.

Under inflated tires wear more at the edges and provide less contact with the road and flex more so they are more likely to overheat and fail - as with the Bridgestone tires that blew on Ford Explorers sending their occupants to their deaths. I would rather be at a known safe tire pressure and then watch the wear pattern than have the tires at the chart pressure which can be 25% less than the vehicle manufacturer's recommendation and hope for the best.
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