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  #1  
Old 05-01-2013, 08:19 AM
NCBEAST NCBEAST is offline
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Default What PSI are you guys running

in the 275/60 R20's? Came with 47 psi from the dealer and felt a little bouncy. I read the door sticker and it said 39 psi. I dropped them down to what I thought 39 psi with my gauge but the dash says 37 psi. Still pretty bouncy?

Your experiences....
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Old 05-01-2013, 08:23 AM
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Mine came with 45psi and seem to be ok to me
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Old 05-01-2013, 09:07 AM
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Go off of your door placard.

They are pretty spot on for OEM tire size & for best ride ride quality, handling and fuel consumption.

Tires almost always come [well] over inflated from production.

My truck had 65PSI at delivery. My previous truck had 72PSI at delivery.


Disadvantages of Underinflation

An underinflated tire can't maintain its shape and becomes flatter than intended while in contact with the road. If a vehicle’s tires are underinflated by only 6 psi it could lead to tire failure. Additionally, the tire’s tread life could be reduced by as much as 25%. Lower inflation pressure will allow the tire to deflect (bend) more as it rolls. This will build up internal heat, increase rolling resistance and cause a reduction in fuel economy of up to 5%. You would experience a significant loss of steering precision and cornering stability. While 6 psi doesn’t seem excessively low, remember, it usually represents about 20% of the tire’s recommended pressure.


Disadvantages of Overinflation

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 running over potholes or debris in the road. Higher inflated tires cannot isolate road irregularities well, causing them to ride harsher. However, higher inflation pressures usually provide an improvement in steering response and cornering stability up to a point. This is why participants who use street tires in autocrosses, track events and road races run higher than normal inflation pressures. The pressure must be checked with a quality air gauge as the inflation pressure cannot be accurately estimated through visual inspection.

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Old 05-01-2013, 09:19 AM
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Mine were 52 at Delivery ... I dropped down to 39 from the door card. After a day or two they settled in.. Seem Good to go now.
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Old 05-01-2013, 12:20 PM
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Mine were all 45 at delivery. Sticker on door sill says 39 psi. Are these TPMS sensors typically off a few psi or pretty accurate?
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Old 05-01-2013, 01:40 PM
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Run the door pressure.

One of the things I did in university was work on a SAE race car team and we did lots of testing on vehicle suspension systems. The biggest thing we found was the tire worked in conjunction with the suspension system to dampen vibration frequency. When you isolate the tire (increase the pressure) you transfer all the vibration to the suspension, which has a must higher damping coefficient. It's designed to absorb the big shock due to its stiffness so the spring doesn't flex due to low input frequencies.

When I pull into an oil change place and they want to inflate my work truck tires to the 'max tire pressure' listed on the tire, I get kind of mad. They don't know what my truck is designed to run at and furthermore I actually run slightly underinflated to allow more surface face along the dirt/rock roads I drive on. I run 10-ply tires to prevent side-wall failure to allow me to roll around underinflated.
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Old 05-01-2013, 10:37 PM
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Same as others, mine came where at 49 and I didn't like the ride. Dropped them down to 40 much better
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