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Old 03-02-2012, 02:51 PM   #1
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Actual height of stock 255\75\17

Anyone measure their stock tires, Mine are 30.50" on the jeep, Why I did this was my GPS said one speed and the jeep said another. Checked the tire size calibration and it was set to 30.75". Set the calibration to 30.50" and now both the GPS and the Jeep speed reads the same.. Find it odd they state the 255/75/17's are 32" tall Must have a lot of air in them when they were measured..

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Old 03-02-2012, 02:58 PM   #2
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All tire mfg measure their tires horizontal--

The air pressure/vehicle weight reduces the INSTALLED vertical diameter-

My Hankook LT295/75x16 tire are 33.6" , untill installed, then at 30psi-they're 33.2"

The circumference stays the same, no matter what !

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Old 03-02-2012, 03:03 PM   #3
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I believe 255/75/17's are supposed to be 32.06" tall prior to mounting and having the weigh of your Jeep on them. Once they are mounted on your wheels and have the weight of your Jeep on them they they are only around 30.75" tall.

At least that is how my 255/75/17 BFG Mud-Terrain T/A KMs are anyways.
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Old 03-02-2012, 03:03 PM   #4
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Based on the numbers they are 32". Variables are vehicle weight, PSI, and side wall stiffness. For instance the stock Rubicon tire has a stiffer sidewalk than the Sport S tire.
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Old 03-03-2012, 08:05 AM   #5
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32.06 inches for Goodyear Wranglers
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Old 03-05-2012, 01:30 PM   #6
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Jimbo, do you run your Hankooks @ 30 psi? Im still trying to find the sweet spot.. Mine measure just under 33" @ 35psi...
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Old 03-05-2012, 05:57 PM   #7
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I just made a trip back to Calif. and I've got mine at 35psi also-


Quote:
Originally Posted by ovrthetop View Post
Jimbo, do you run your Hankooks @ 30 psi? Im still trying to find the sweet spot.. Mine measure just under 33" @ 35psi...
Usually when I stay in nevada I keep the tires at 32 front/30 rear-

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Old 03-05-2012, 05:59 PM   #8
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a good rule of thumb is to take away .75 to 1 inch of what dealer advertises the actual size of their tire..

like jb said.. once tire is at comfortable ride pressures, and weight on top of it.. ur not going to be the same size of the website.. they tend to measure theirs at max pressure with no weight.. makes a big difference.
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Old 03-05-2012, 10:31 PM   #9
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They are pretty stiff @ 35psi...
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Old 03-05-2012, 10:43 PM   #10
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Can't tell, my jeep rides like a jeep, so They don't feel different to me and/w my shocks-the ride is controlled and "firm" anyway-

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Old 03-05-2012, 10:47 PM   #11
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Yeah I'm pretty certain the tires aren't completely to blame... coil spacers and stock susp don't help either ;-)
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Old 05-09-2012, 08:15 PM   #12
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I'm curious if stock Rubicon tires are taller than 31" when loaded due to the stiffer sidewall. Has anyone measured their Rubicon front tire height with load on the tires?
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Old 05-09-2012, 08:29 PM   #13
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Quote:
Originally Posted by ThingsAbove
I'm curious if stock Rubicon tires are taller than 31" when loaded due to the stiffer sidewall. Has anyone measured their Rubicon front tire height with load on the tires?
30.75 from the ground up and I am at about 36psi
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Old 05-10-2012, 08:56 AM   #14
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I just measured my 255/75R17s.

I copied my post from here http://www.wranglerforum.com/f33/31-...ft-157107.html

Quote:
Originally Posted by mgola27 View Post
I wrapped the masking tape around the center of the tread of my spare (unused, fully inflated), overlapping the tape by a few inches. I then cut the tape through where it overlapped to ensure an accurate length. I measured the length of the tape to find the circumference. From there, I used math to get an actual diameter of my tire.

I came up with 99-15/16" or 99.9375" for the circumference of my unused, properly inflated (35psi) spare.

Using the C = 3.14 * d formula, this is what I've come up with (showing my work per my high school geometry teacher ):

99.9375 = 3.14 * d
99.9375 / 3.14 = d
d = 31.8272

So, I've come to the conclusion that my OE tires, when new have a diameter of 31.8".
Now, I know this changes under the weight of the Jeep, and with different sidewall stiffness, so this may be of no use to you regarding the speedo calibration, but thought I'd share what I found.
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Old 05-10-2012, 12:05 PM   #15
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Quote:
Originally Posted by mgola27
I just measured my 255/75R17s.

I copied my post from here http://www.wranglerforum.com/f33/31-...ft-157107.html

Now, I know this changes under the weight of the Jeep, and with different sidewall stiffness, so this may be of no use to you regarding the speedo calibration, but thought I'd share what I found.
Thats hard on the brain. Just ask next time. OEM tires are known to most as sub 32" treads.....lol.
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Old 05-10-2012, 12:45 PM   #16
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Are you going to tell him that the speedo and the nav is going to read the same?


Quote:
Originally Posted by JIMBOX View Post
All tire mfg measure their tires horizontal--

The air pressure/vehicle weight reduces the INSTALLED vertical diameter-

My Hankook LT295/75x16 tire are 33.6" , untill installed, then at 30psi-they're 33.2"

The circumference stays the same, no matter what !

JIMBO
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Old 05-10-2012, 12:49 PM   #17
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Well, if it's the stock-ON BOARD NAV-yes-


Quote:
Originally Posted by jmcd View Post
Are you going to tell him that the speedo and the nav is going to read the same?
I don't know for positive, cause I don't have one, I used my seperate TomTom to double check mine-

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