PSI on road?
JK Junkie
Joined: Mar 2011
Posts: 2,145
Likes: 4
From: Israel
The proper pressure is the pressure that makes the tread seat flat, in which case the tire will grip better, wear evenly and more slowly, and will be useful for more miles.
A chalk test will show you what psi would be optimal for the front or rear tires:
Start with 30psi for C or D load rated tires, 26psi for E.
Mark a chalk line across the tire tread.
Drive – a few tire rotations – on dry & smooth road.
Change pressure in 2 psi steps.
Chalk test both front and rear.
Mark a chalk line across the tire tread.
Drive – a few tire rotations – on dry & smooth road.
Change pressure in 2 psi steps.
Chalk test both front and rear.
Last edited by GJeep; Feb 25, 2015 at 11:25 PM.
Thread Starter
JK Newbie
Joined: Jul 2014
Posts: 57
Likes: 0
When I got these tires from being mounted, the shop had them at 40 lbs. The Jeep road like a hay wagon, terrible even for a jeep. So I aired down to 30 psi and seems to ride much better. I will do the chalk test to try and dial in the perfect psi for daily driving. Thanks for the input!
JK Freak
Joined: May 2013
Posts: 772
Likes: 0
From: Cody, WY
Every jeep is going to run a different air pressure. Some rigs weigh more than others, tire sizes are different, load ranges are different. The best way to figure out the right PSI is to do the chalk test.
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Thread Starter
JK Newbie
Joined: Jul 2014
Posts: 57
Likes: 0
How did your Bighorns wear, I went on a whim buying them. Just liked the tread pattern, plus always ran Maxxis tires riding BMX, so was curious on how their automotive tires were.
JK Jedi Master
Joined: Jan 2008
Posts: 11,463
Likes: 165
From: Austin <--> Colorado Springs
They were good tires, wore well, no issues offroad or long distance freeway. Went with them based on the good reviews, the looks, and the deciding factor was that they were about $100 per tire cheaper than the km2's and mtr/k's I was looking at.
But ... after a few years, three of the five tires developed cracks between the tread blocks that went down to the core. Don't know if it was a problem with those three tires, or some weird kind of trail damage, or maybe just that I don't drive that much and had two tires and the spare always sitting in the sun.
They were warrantied by Discount tire with no issue, but rather than run 3 new and 2 half worn, I opted for a pro-rate and moved up to 37's. (If they made 37" bighorns, I wouldn't have had a problem running them again, even with the cracking.)
But ... after a few years, three of the five tires developed cracks between the tread blocks that went down to the core. Don't know if it was a problem with those three tires, or some weird kind of trail damage, or maybe just that I don't drive that much and had two tires and the spare always sitting in the sun.
They were warrantied by Discount tire with no issue, but rather than run 3 new and 2 half worn, I opted for a pro-rate and moved up to 37's. (If they made 37" bighorns, I wouldn't have had a problem running them again, even with the cracking.)
Last edited by nthinuf; Feb 25, 2015 at 04:40 PM.
