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Old 12-26-2012, 09:57 PM
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New wheels/tires require speedo recalibration?

I put a set of wheels/tires from a 2012 Wrangler on my 2007 WK. New combo diameter considerably larger than stock. I understand the speedo will read low, but is there any NEED to have the speedo recalibrated at the dealer ($45.00)? I plan to swap back to the OEM combo during the summer months. I don't want to recalibrate every 6 months if I don't need to.
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Old 12-27-2012, 09:14 AM
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Re: New wheels/tires require speedo recalibration?

Use a tire size calculator to see how far your speedometer is off. Here is the thread... tire size calculator . I had a F-150 that had factory 17" wheels and I put on 20". Speedo was exactly the same because of tire size
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Old 12-27-2012, 09:38 AM
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Re: New wheels/tires require speedo recalibration?

hypertech makes a calibrator... see the link below. They're around $230.

Error - Hypertech
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Old 12-27-2012, 10:30 AM
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Re: New wheels/tires require speedo recalibration?

Get a Diablosport Intune and you can adjust it, along with tuning that will bring the Hemi more to life.
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Old 12-27-2012, 11:23 AM
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Re: New wheels/tires require speedo recalibration?

Thanks for all the tips. I went to the "tire size calculator" thread provided by "06HemiLtd" and tried 3 of the links in the thread. The calculator at Car / SUV / Van / Light Truck Tire Calculations was dead simple and the one I used. The new 255-70R18s are about 8 inches larger in diameter than the 245-65R17s that are OEM. So now I knw that a speedo reading of 65mph is really 70mph.

BUT, the question that remains is; Is there any system need for a recalibration? Will this inaccuracy have any negative effect on any vehicle systems?

thanks
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Old 12-27-2012, 12:06 PM
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Re: New wheels/tires require speedo recalibration?

every calculation that your computer does using wheel spin, speed, etc, will be off.

so will all your traction control, ABS, etc.

hence a 230 price to calibrate the computer/
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Old 12-27-2012, 07:48 PM
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Re: New wheels/tires require speedo recalibration?

Thanks Robpp;
My dealer quoted me $45.00.
Is that a super deal??
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Old 12-27-2012, 09:59 PM
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Re: New wheels/tires require speedo recalibration?

Quote:
Originally Posted by Jim Shane View Post
Thanks Robpp;
My dealer quoted me $45.00.
Is that a super deal??
The dealer can only go up to a certain size... i BELIEVE its 31"

I'm sure somebody here will know.
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