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Old 01-11-2012, 07:42 AM
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What tire pressure for 275/65/18?

Hello all, what tire pressure would you recommend Sahara Unlim with 275/65/18? thanks! Door panel is 35 max.

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Old 01-11-2012, 08:35 AM   #2
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Quote:
Originally Posted by Sahara33
Hello all, what tire pressure would you recommend Sahara Unlim with 275/65/18? thanks! Door panel is 35 max.
The door panel is referring to stock tires. Since you have replaced those with a different size, you can ignore that number. Best thing to do is a chalk test.

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Old 01-11-2012, 07:10 PM   #3
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See post #54 for a description of the chalk test. Best way I know of to ensure that your tires are properly inflated.

Don't go by the door placard or the PSI recommended at tire shops...use the chalk test.

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Old 01-11-2012, 10:32 PM
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Got it, will do the chalk test. Thanks!

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Originally Posted by kbwwolf View Post
See post #54 for a description of the chalk test. Best way I know of to ensure that your tires are properly inflated.

Don't go by the door placard or the PSI recommended at tire shops...use the chalk test.

Highway speed drifting
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Old 01-24-2012, 10:37 PM   #5
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Originally Posted by Sahara33
Got it, will do the chalk test. Thanks!
10$ on 29 psi

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Old 01-30-2012, 12:12 PM
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Is that what your are at? I tried the thick kids street chaulk, but it didnt come off the tires onto the street. I guess I need to try something else.


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10$ on 29 psi

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Old 01-30-2012, 12:13 PM
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Okay, chaulk did come off the tires onto the street. What is the pressure anyone have with 275/65/18s? thanks


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Hello all, what tire pressure would you recommend Sahara Unlim with 275/65/18? thanks! Door panel is 35 max.
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Old 01-30-2012, 03:51 PM   #8
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Is that what your are at? I tried the thick kids street chaulk, but it didnt come off the tires onto the street. I guess I need to try something else.

Negative. I don't run this size. 29 psi is a SWAG based on load and inflation tables.

For P275/65 R18 load index 144, the table goes:

26 psi=2260 lbs
29 psi=2381 lbs
32 psi=2502 lbs
35 psi=2601 lbs

For your P255/70 R18 stock tires:

26 psi=2127 lbs
29 psi=2249 lbs
32 psi=2359 lbs
35 psi=2469 lbs

I would use 32 as a starting point for that chalk test. Most likely will be lower in the end. Hence the 10$ bet on 29

Sorry for the confusion

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Old 01-30-2012, 05:04 PM   #9
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Yup, DB's making a safe bet. Roughly, you should be around 30-32 PSI. I'm hoping you settle on 30 so DB's avatar of Pepe le Pew will quit looking so smug.
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Old 01-30-2012, 09:34 PM   #10
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Yup, DB's making a safe bet. Roughly, you should be around 30-32 PSI. I'm hoping you settle on 30 so DB's avatar of Pepe le Pew will quit looking so smug.


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Old 01-31-2012, 01:19 AM   #11
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I work at a tire shop and I always ignore the door panel! Especially with jeeps... I run about 30 in the jeeps that I work on... But what is the chock test? I've never heard of that...
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Old 01-31-2012, 10:00 AM
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I currently have 32 psi. Once I find chaulk that works I'll try it again. So from the scale below for the 275/65, my 2011 JKU sahara crub weight is 4294. How does thar translate to the 2260, 2381...? So, for the $10 bet do you take a check

Quote:
Originally Posted by Dick Blonov View Post
Negative. I don't run this size. 29 psi is a SWAG based on load and inflation tables.

For P275/65 R18 load index 144, the table goes:

26 psi=2260 lbs
29 psi=2381 lbs
32 psi=2502 lbs
35 psi=2601 lbs

For your P255/70 R18 stock tires:

26 psi=2127 lbs
29 psi=2249 lbs
32 psi=2359 lbs
35 psi=2469 lbs

I would use 32 as a starting point for that chalk test. Most likely will be lower in the end. Hence the 10$ bet on 29

Sorry for the confusion

DB
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Old 01-31-2012, 10:02 AM
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See KBWWOLF post above for the chaulk test.


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Originally Posted by YJKyle19 View Post
I work at a tire shop and I always ignore the door panel! Especially with jeeps... I run about 30 in the jeeps that I work on... But what is the chock test? I've never heard of that...
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Old 01-31-2012, 10:07 AM   #14
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Originally Posted by Sahara33 View Post
I currently have 32 psi. Once I find chaulk that works I'll try it again. So from the scale below for the 275/65, my 2011 JKU sahara crub weight is 4294. How does thar translate to the 2260, 2381...? So, for the $10 bet do you take a check
Another version of the chalk test is to simply draw a straight line across your tires, then drive on em and see how the line itself wears. You can use chalk, grease pencil, crayon, etc...just make sure it's a dry day.

Here's a link:

Tire Pressure Tips - JP magazine
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Old 01-31-2012, 10:08 AM   #15
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DB
Not that I have anything at all against Monsieur le Pew, mind you. In the cartoon kingdom, he rules.
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Old 01-31-2012, 10:10 AM   #16
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Originally Posted by YJKyle19 View Post
I work at a tire shop and I always ignore the door panel! Especially with jeeps... I run about 30 in the jeeps that I work on... But what is the chock test? I've never heard of that...
Quote:
Originally Posted by Sahara33 View Post
I currently have 32 psi. Once I find chaulk that works I'll try it again. So from the scale below for the 275/65, my 2011 JKU sahara crub weight is 4294. How does thar translate to the 2260, 2381...? So, for the $10 bet do you take a check
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Originally Posted by Sahara33 View Post
See KBWWOLF post above for the chaulk test.
If my explanation was confusing somehow, here's an online one that might explain it more succinctly:

How to Chalk Tires | eHow.com
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Old 01-31-2012, 05:54 PM   #17
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Oh wow I like that.. I gotta try it haha
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Old 02-01-2012, 10:31 PM   #18
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I currently have 32 psi. Once I find chaulk that works I'll try it again. So from the scale below for the 275/65, my 2011 JKU sahara crub weight is 4294. How does thar translate to the 2260, 2381...? So, for the $10 bet do you take a check
Suspense is killing me

How'd you make out?

Chalk? Crayon?

And unless you ended up @29 PSI, I'll end up shoving 10$ in your paypal account

Oh and the curb weight, forget that part. Does not even compute with the placard recommended psi for stock tires

DB
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Old 02-09-2012, 07:29 AM
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didnt try it yet. For some reason the chaulk I have doesnt come off the tires onto the road. To be continued.... I now have 30 psi.


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Suspense is killing me

How'd you make out?

Chalk? Crayon?

And unless you ended up @29 PSI, I'll end up shoving 10$ in your paypal account

Oh and the curb weight, forget that part. Does not even compute with the placard recommended psi for stock tires

DB

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