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Old 04-10-2013, 08:38 PM
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Question Advice on tire pressure

I recently purchased and installed new tread on my 2012 Rubicon. The tires are 295/65R-18 Goodyear DuraTrac's, load range E, mounted on 18x9 KMC XD Addict's from the Tire Rack. OEM's were 255/75R-17 BF Goodrich Mud Terrain's (running at approx. 37psi).
I realize that the load range E will produce a stiffer ride on my 2 door, but at highway speeds I bounced all over the road. When I checked the pressures in each tire I was surprised to see that they all were set to 76 psi directly from Tire Rack.
I've reduced each tire to 50 psi and now have a more controllable ride at highway speeds. Are there any recommendations out there as to what pressure I should be running for mostly highway driving?
Thanks for any advice given.

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Old 04-11-2013, 08:41 AM   #2
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Experienced the same thing yesterday with my new wheels and tires from DTD. For whatever reason they inflate the tires to max sidewall pressure before shipping. Mine were at 68.5 and i was bouncing everywhere...came home checked and started to de-air them. I put them at 35psi and took another ride and man what a difference...now my tires are D sidewall rated so they are going to be a bit softer than yours anyway. I think i hear a lot of guys running as low as 27 for road driving. I think its something you just have to mess with to get the ride you want. Keep in mind that the lower you go you may start to cup the tread on the tire and get premature wear.

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Old 04-11-2013, 07:22 PM   #3
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Mine new pro comps and duratracs had a sticker on them from dtd stating that they always inflate to max pressure.
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Old 04-12-2013, 12:14 AM   #4
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That sort of pressure is dangerous. I would keep them at around 32, do the chalk test, and I bet you will end up at 26-32 somewhere. Mine are C rated 35" MTR Kevlars and I have them at 32. Will do a chalk test soon, but I doubt I will be going up in psi.
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Old 04-12-2013, 12:16 AM
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Thanks for the info. I'll start lowering the pressures at 5# increments and do a little road testing. Thanks again.
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Old 04-13-2013, 06:24 PM   #6
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Originally Posted by HK_Runner View Post
That sort of pressure is dangerous. I would keep them at around 32, do the chalk test, and I bet you will end up at 26-32 somewhere. Mine are C rated 35" MTR Kevlars and I have them at 32. Will do a chalk test soon, but I doubt I will be going up in psi.
^^ This.

And he's right, 50 PSI is way too high. I can't even imagine running that. It's bordering on criminal, and your Jeep probably drives like shit.

Unfortunately, most tire shops and dealerships will stick at least 36 PSI in your aftermarket tires, as per the Wrangler door placard. It's flat-out too much.

As a general rule, for 33" tires you want 30-32 PSI. For 35", 28-30 PSI. I run 35" DuraTracs (in 16", which are E-rated, and require a higher PSI) at 31 PSI, which is optimum wear for my setup.
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Old 04-14-2013, 01:49 PM   #7
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Very True

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Originally Posted by kbwwolf View Post
^^ This.

And he's right, 50 PSI is way too high. I can't even imagine running that. It's bordering on criminal, and your Jeep probably drives like shit.

Unfortunately, most tire shops and dealerships will stick at least 36 PSI in your aftermarket tires, as per the Wrangler door placard. It's flat-out too much.

As a general rule, for 33" tires you want 30-32 PSI. For 35", 28-30 PSI. I run 35" DuraTracs (in 16", which are E-rated, and require a higher PSI) at 31 PSI, which is optimum wear for my setup.
I just got my tires and wheels put on. My tires are 33" BFG Mud Terrains. We took it down the road after getting it lifted and tires put on and it drove like shit. I got home and was playing with the console and saw it said my tires were all at 65PSI. I took them down to 32PSI and what a difference it made. It is night and day.
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Old 04-14-2013, 02:39 PM   #8
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I just got my tires and wheels put on. My tires are 33" BFG Mud Terrains. We took it down the road after getting it lifted and tires put on and it drove like shit. I got home and was playing with the console and saw it said my tires were all at 65PSI. I took them down to 32PSI and what a difference it made. It is night and day.
65 PSI?



Dude who did that should marched to the public square, tied up, flogged with folded coat hangers, then have rock salt rubbed into his wounds.

Okay, maybe spare the salt.

But still...

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