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Tuner for Speedometer??

2K views 9 replies 7 participants last post by  Silverbullet14 
#1 ·
I have a 2014 diesel limited and just put 275/65/r18 tires and a RRO lift on it. I wanted to know if there is a tuner or anyway to recalibrate the speedometer for the bigger tire size ?


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#5 ·
The factory tires are 30.4" I believe and mine are 32" so the speedometer is off by about 4% ... I heard it is not adjustable from Jeep so I was curious if a tuner/chip can help


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#8 ·
I have 33" tires on my 2014. The dealer can change tire size for the vehicle, but they can only select the size from a few choices. They selected the biggest tire from the list for mine. Right now at 60 MPH on the speedo I am reading 63 on GPS. At 40 MPH I am reading 41.5 on GPS.

I have not been able to come up with an aftermarket device to truly correct the speedo to date.
 
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