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Old 12-31-2012, 12:01 PM   #29
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Plus, the pressure goes up 5-10 psi, after about 10-20 miles on the road.
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Old 12-31-2012, 03:20 PM   #30
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always inflate to whatever it says on the sidewall of the tire. Not what is says anywhere else. 60 psi in E rated tire will cause premature tire failure. Alan
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Old 12-31-2012, 03:49 PM   #31
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Originally Posted by acokeday View Post
always inflate to whatever it says on the sidewall of the tire. Not what is says anywhere else. 60 psi in E rated tire will cause premature tire failure. Alan
60 PSI in an E rated tire is fine provided the tire is not loaded beyond the manufactures pressure/load rating. The side wall pressure is for the tire at maximum load. So weigh the rig and air the tires according to the actual load with about 5 PSI as a buffer, but not over the max pressure per the sidewall.

Over inflation for the tire load will cause premature wear in the center of the tire.

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Old 12-31-2012, 08:27 PM   #32
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Actually tire pressures are not arbitrary. They are set and certified by the vehicle manufacturer. Deviations and special circumstances for conditions will be found in the individual vehicle’s owner’s manual.

Tire pressures for your OE tires and like sized replacements will be found on the vehicle’s certification label and/or tire placard. Plus sized aftermarket replacements will often require new recommended tire pressures. Those pressures will be derived from the load capacity of the OE tires. The installer should make a notation in the owners manual and place an auxiliary tire placard near the original.

Tires found to be 20% below the vehicle manufacturers recommended (correct) tire pressure are considered to be flat and need to be inspected for damage by experienced personnel.

It’s very important to remember, tire manufacturers DO NOT set vehicle recommended tire pressures, vehicle manufacturers do. You can find a statement very similar to that in large red letters in the NHTSA tire safety brochure.

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Old 01-01-2013, 06:45 PM   #33
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Actually tire pressures are not arbitrary. They are set and certified by the vehicle manufacturer. Deviations and special circumstances for conditions will be found in the individual vehicle’s owner’s manual.

Tire pressures for your OE tires and like sized replacements will be found on the vehicle’s certification label and/or tire placard. Plus sized aftermarket replacements will often require new recommended tire pressures. Those pressures will be derived from the load capacity of the OE tires. The installer should make a notation in the owners manual and place an auxiliary tire placard near the original.

Tires found to be 20% below the vehicle manufacturers recommended (correct) tire pressure are considered to be flat and need to be inspected for damage by experienced personnel.

It’s very important to remember, tire manufacturers DO NOT set vehicle recommended tire pressures, vehicle manufacturers do. You can find a statement very similar to that in large red letters in the NHTSA tire safety brochure.

FastEagle
You are correct. The final analysis of the Ford Explorer roll-overs lawsuit was that the vehicle manufacturers tire pressure recommendation was based on ride quality, not tire manufucturer load/inflation chart recommendations. Ford ignored tire manufacturers recommendations and adopted their own pressure recommendations for best ride quality.
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