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Old 01-14-2013, 05:17 PM   #1
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Tire pressure

So as the wife was driving out of the garage this morning, I noticed the edges of the tires weren't wet (it was raining). the jeep has been riding a little rough since it was new. The door sticker calls for 35 lbs and they read 38 lbs. I don't think 3 lbs would do it, and it's not hard to check, but I'm just wondering if the door sticker might be a guideline and correct pressure will vary from tire to tire depending on sidewall stiffness and seven other things.
Anyone got any thoughts on tire contact patch??

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Old 01-14-2013, 05:19 PM   #2
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What size tires are they?

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Old 01-14-2013, 05:20 PM   #3
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Quote:
Originally Posted by hillrider View Post
So as the wife was driving out of the garage this morning, I noticed the edges of the tires weren't wet (it was raining). the jeep has been riding a little rough since it was new. The door sticker calls for 35 lbs and they read 38 lbs. I don't think 3 lbs would do it, and it's not hard to check, but I'm just wondering if the door sticker might be a guideline and correct pressure will vary from tire to tire depending on sidewall stiffness and seven other things.
Anyone got any thoughts on tire contact patch??
Seems I have heard many on here say they are running 30 lbs with larger tires.

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Old 01-14-2013, 05:23 PM   #4
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I have my 33x12.50 DuraTracs set to 32 an they ride as smooth as can be an most all of the tread touches the road
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Old 01-14-2013, 05:30 PM   #5
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Which tires? And do you have TPMS? It can get annoying when you get lower than the door post listing.

Bob K.
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Old 01-15-2013, 09:44 AM   #6
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Bronco, they are Wrangler SRA 255/75/17's. I just dropped the pressure from 38 to 35 and it's still raining (seems like I live in the NW), so I'll see what they look like when she leaves this morning. (I would go down to 30, but i hate to give up the nitrogen)
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Old 01-15-2013, 10:07 AM   #7
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The correct pressure for your 255/75/17s is 37psi cold.
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Old 01-15-2013, 10:43 AM   #8
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I run 265/70-17 "C" Duratracs at 33psi and the TPMS does not come on. From what I experienced over multiple vehicles is that TPMS systems may allow 15-20% deviation from the psi on the OEM sticker before activating the warning light. When my Duratracs were first installed, they were at 38psi cold (too high) but my TPMS light stayed on for several hours of short trip driving over two days before going out. They're at 33psi now for proper contact patch and no TPMS light (it does come on at start up as a check as do all other warning lights).
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Old 01-15-2013, 01:49 PM   #9
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The correct pressure for your 255/75/17s is 37psi cold.
But what I'm wondering is - at correct pressure, should not all of the tread be touching the ground?
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Old 01-15-2013, 02:28 PM   #10
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Tpms solution .. Aev pro cal , I have 33"s on 16 inch rims so the sensors are not ideal . Turned off the tpms with the pro cal and set factory settings to read the correct tire size. Best purchase yet .
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Old 01-15-2013, 02:30 PM   #11
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And for the treads they most likely wont all touch , the outside edge is dry on mine when it's wet out . Idea: rotate tires see if there's a difference
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Old 01-15-2013, 09:21 PM   #12
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But what I'm wondering is - at correct pressure, should not all of the tread be touching the ground?
The stock SR-As are pretty much going to ride 80% or more in the middle at correct pressure. The correct pressure can also be viewed inside your driver side door panel. 35-37 max cold is perfectly safe and normal for those tires.
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Old 01-15-2013, 09:55 PM   #13
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Bronco, they are Wrangler SRA 255/75/17's. I just dropped the pressure from 38 to 35 and it's still raining (seems like I live in the NW), so I'll see what they look like when she leaves this morning. (I would go down to 30, but i hate to give up the nitrogen)
nitrogen is free in the air we breath lol.
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Old 01-16-2013, 12:09 AM   #14
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And do you have TPMS? It can get annoying when you get lower than the door post listing.
What do you mean? Does it start bleating alarms right at the door-post mark? I'd have imagined it'd tolerate a psi or two.
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Old 01-17-2013, 03:15 AM   #15
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Settled on 32 lbs. They came from the factory at 38. They sticker said 35 and when I dropped to that, I picked up 1/2 inch of contact patch. Another 3 lb drop didn't improve the patch but improved stability. Think I'll stay at 32. thanks for the help
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Old 01-17-2013, 08:12 AM   #16
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Best way to get your optimum PSI for everyday road use is via the chalk test. Link below...

How to Chalk Tires | eHow.com

Use the chalk that carpenters use in string lines, so it'll transfer well from your tires to the asphalt. Don't buy the permanent chalk...it'll say on the bottle.

Simplest method is to chalk a tire, then drive on it for a few miles and see how the chalk wears. If it wears just in the center, you're overinflated. Just on the edges of the tire, you're underinflated. Takes a little trial and error, but once you get it right you'll get maximum life outta your tires.
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Old 01-17-2013, 09:07 AM   #17
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The sensor is...a sensor. It's hard to say how accurate it or your gauge is. You get below it chimes. And then dings for every sensor that reads low. Every time you start it up.

Bob K.

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