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Old 03-21-2012, 08:04 PM   #1
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What are Procal setting you guys using for your 33" Duratracs?

I am using 32" But I remeasured tonight, and they seem like they are around 31.75"

What are you all using? I think I need to recalibrate

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Old 03-21-2012, 08:12 PM   #2
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It has to do a lot with tire pressure. Two people can have the same tier and run different tire pressures with different results. Duratracs tend to be run at lower pressure

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Old 03-21-2012, 08:14 PM   #3
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Quote:
Originally Posted by rics1997 View Post
It has to do a lot with tire pressure. Two people can have the same tier and run different tire pressures with different results. Duratracs tend to be run at lower pressure
^^^ This.

Use a 4-foot level and a tape measure to determine actual tire size, and use that #.

Quote:
Originally Posted by New2012JEEP View Post
I am using 32" But I remeasured tonight, and they seem like they are around 31.75"

What are you all using? I think I need to recalibrate
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Old 03-21-2012, 08:22 PM   #4
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Will do guys, thanks, I have a yardstick to keep straight, I will remeasure.

Would you recalibrate for 1/4"?

Would you go off your rear tires, or front, or air them all to the same size/pressure?
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Old 03-21-2012, 08:38 PM   #5
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31.75 works out to be a match on my speedo and odo to my Garmin Montana 600. That's over a lot of miles too....
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Old 03-21-2012, 08:43 PM   #6
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Quote:
Originally Posted by New2012JEEP
I am using 32" But I remeasured tonight, and they seem like they are around 31.75"

What are you all using? I think I need to recalibrate
I didn't change mine when I went to the 33's. I took out the gps and it was spot on so I left it.
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Old 03-21-2012, 08:44 PM   #7
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Quote:
Originally Posted by CG3 View Post
31.75 works out to be a match on my speedo and odo to my Garmin Montana 600. That's over a lot of miles too....
Thanks CG, I was looking for backup, didn't know if I should for the 1/4", but they really seem to be 31.75".

surprised they are called 33's, well I guess you can air them to 33" and ride the center channel, lol.
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Old 03-21-2012, 08:45 PM   #8
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Originally Posted by Sueby View Post
I didn't change mine when I went to the 33's. I took out the gps and it was spot on so I left it.
same here
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Old 03-21-2012, 08:47 PM   #9
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Originally Posted by cosmos View Post
same here
Gotcha. I never had stock steelies. She came home with Bighorns on it, which seemed to be a true 33 or overinflated, whatever, lol. So I did have to adjust downward for the DT's
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Old 03-21-2012, 09:19 PM   #10
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My speedo was right on without changing the tire size with my Procal as confirmed with gps so I didn't change it.
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Old 03-21-2012, 11:13 PM   #11
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I measured my right rear tire at 33.25 and set my AEVPM--
Exactly KORECT-

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Old 03-22-2012, 01:15 AM   #12
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Hmmm........I keep coming up with 31.5" on my Duratracs?
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Old 03-22-2012, 01:59 AM   #13
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I have a yardstick to keep straight
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Old 03-22-2012, 04:20 AM   #14
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My 285 70 R17's measured to 32.6 aired at 34lbs. GPS says speedo is dead on.
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Old 03-22-2012, 05:42 AM   #15
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Quote:
I measured my right rear tire at 33.25 and set my AEVPM--
Exactly KORECT-
Quote:
Hmmm........I keep coming up with 31.5" on my Duratracs?
1.75", that is a huge difference for the same tire size. What air pressure where you two running at the time you measured?
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Old 03-22-2012, 07:48 AM   #16
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I have 33's and a procal but did not need it as the speedo reads correctly with the 33's (I had 32's from the factory).
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Old 03-22-2012, 08:29 AM   #17
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Quote:
Originally Posted by tomthbomb View Post
1.75", that is a huge difference for the same tire size. What air pressure where you two running at the time you measured?
I don't have Duratracs-mine are Hankooks--LT295/75x16/30psi-

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Old 03-22-2012, 08:40 AM   #18
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Quote:
Originally Posted by SilverRubi
Hmmm........I keep coming up with 31.5" on my Duratracs?
Im at 31.75 on mine too, will check pressure tonight I guess. Considering Jimbo almost 2" greater
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Old 03-22-2012, 08:44 AM   #19
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Quote:
Originally Posted by New2012JEEP

Im at 31.75 on mine too, will check pressure tonight I guess. Considering Jimbo almost 2" greater
Jimbo is running a different tire and size though. He has 295/75/16 Hankook Dynapros I believe.
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Old 03-22-2012, 08:46 AM   #20
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I also didnt change mine. Before I switched out the old wheels/tires, I took a control reading with the gps. After the new DTs went on, I redid the GPS run and the spedo was barely off and likely within the tolerance of the spedo and GPS anyway. I havent thought about it since

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