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Old 03-03-2012, 10:35 PM   #1
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2012 Jeep Wrangler with 33" tires

I just installed 285/75R16 which changed my speedometer by about 6-8 MPH,s. how do I calibrate my speedometer?

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Old 03-03-2012, 10:47 PM   #2
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I just installed 285/75R16 which changed my speedometer by about 6-8 MPH,s. how do I calibrate my speedometer?
Buy an AEV Procal. It does a bunch of other handy things, too, such as adjusting TPMS, engine idle, shift points, etc.

ProCal Module - Shop By Category

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Old 03-03-2012, 11:34 PM   #3
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+1 Buy an AEV Procal.
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Old 03-03-2012, 11:42 PM   #4
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x2 Procal
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Old 03-04-2012, 10:27 AM   #5
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AEV Procal, very easy to use and works great. I know I use it.
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Old 03-04-2012, 10:42 AM   #6
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Just in case nobody else has mentioned it--

Getta AEV Procal Module -

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Old 03-04-2012, 11:59 AM   #7
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get a what? lol
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Old 03-04-2012, 12:10 PM   #8
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Eh..... Identical to JB's post lol
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Old 03-04-2012, 12:20 PM   #9
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told um i already got one
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Old 03-05-2012, 08:52 AM   #10
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I just installed 285/75R16 which changed my speedometer by about 6-8 MPH,s. how do I calibrate my speedometer?
Did you put the new tires on the stock steel 16" wheels? I'd like to see a picture if that's what you did.
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Old 03-06-2012, 09:43 PM   #11
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Did you put the new tires on the stock steel 16" wheels? I'd like to see a picture if that's what you did.

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Old 03-06-2012, 09:52 PM   #12
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Looks great, congrats on the new tires. Did you go with the load range "D" or "E"?
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Old 03-06-2012, 09:57 PM   #13
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Load range E.
I am still thinking about some rims.........maybe chrome w/black highlites??!
Comments!
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Old 03-06-2012, 10:22 PM   #14
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Looks sweet man. Congrats, go wheeling!!
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Old 03-06-2012, 10:29 PM   #15
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wow you went to load range E for your wrangler. don't hear that to often. how does it ride with that load range for you and at what psi are you running at?
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Old 03-06-2012, 10:32 PM   #16
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wow you went to load range E for your wrangler. don't hear that to often. how does it ride with that load range for you and at what psi are you running at?
Actually it rides quite nice. I am running them on 60psi right now since I live so far from Tucson. Lots of highway miles. They actually feel real good.
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Old 03-06-2012, 10:34 PM   #17
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60 psi?!?
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Old 03-06-2012, 10:42 PM   #18
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60 psi?!?
suggestions?
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Old 03-06-2012, 10:47 PM   #19
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Quote:
Originally Posted by Fore2558

Actually it rides quite nice. I am running them on 60psi right now since I live so far from Tucson. Lots of highway miles. They actually feel real good.
60 psi and my head would be hitting the freedom panel
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Old 03-06-2012, 10:49 PM   #20
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Originally Posted by Fore2558

suggestions?
I have 33" duratracs and they get mostly highway miles as well but run closer to 32psi
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Old 03-06-2012, 10:57 PM   #21
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60!?!? Damn! I strongly encourage you to do a chalk test on those. Right now, you are probably on running on the center of the tread due to overinflation. They should really be in the 28-32 range.
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Old 03-06-2012, 11:16 PM   #22
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60!?!? Damn! I strongly encourage you to do a chalk test on those. Right now, you are probably on running on the center of the tread due to overinflation. They should really be in the 28-32 range.
Load E tires do list like 80psi cold. But that would be on a heavier vehicle I would think ?
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Old 03-06-2012, 11:38 PM   #23
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Load E tires do list like 80psi cold. But that would be on a heavier vehicle I would think ?
Correct.. Vehciles as light as a wrangler are best suited to be running load range C tires.. So i am always interested in hearing about those running load range E tires on those who have lighter Jeeps and how they like their ride
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Old 03-07-2012, 12:12 AM   #24
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Mine are 275/65/R18 Kelly tsr which are pretty much the same as duratracs.. They are load E and I run them at 32 psi should I go higher?
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Old 03-07-2012, 05:45 AM   #25
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did you put on a set of spacers? if not do you have any rubbing issues?
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Old 03-07-2012, 06:44 AM   #26
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Quote:
Originally Posted by XJ Knight
Correct.. Vehciles as light as a wrangler are best suited to be running load range C tires.. So i am always interested in hearing about those running load range E tires on those who have lighter Jeeps and how they like their ride
MTRS (E) on my Tj = fail, it was unbearable.

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Old 03-07-2012, 07:39 AM   #27
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A common mistake made is putting the max inflation in tires by reading the sidewall, although it is important to know the max a tire can carry you should always go off the door placard. Managing a tire business for years I would see customers come in with ride complaints after getting an oil change at the express lube places where the techs would just fill all tires to max inflation, with most vehicles 2007 or newer its Going to set off your tpms also.
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Old 03-07-2012, 08:07 AM   #28
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Mine are 275/65/R18 Kelly tsr which are pretty much the same as duratracs.. They are load E and I run them at 32 psi should I go higher?
No, I wouldn't.
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Old 03-07-2012, 09:02 AM   #29
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60!?!? Damn! I strongly encourage you to do a chalk test on those. Right now, you are probably on running on the center of the tread due to overinflation. They should really be in the 28-32 range.
I will be conducting a chalk test today.
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Old 03-07-2012, 09:22 AM   #30
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i have the toyo open country 295/70/17's load e and I run around 30psi... ride is pretty good for that tire IMO

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