Originally Posted by ML8789
I have a Trailhawk on order. I had planned to get some 20 inch rims and go with a little taller and wider tire. While that may be doable, or just going with a little taller tire like you're inquiring about, I was informed that the factory speedometer doesn't offer calibration capabilities. I had assumed it would, similar to what can be done with the Wranglers. Apparently that is not the case. It might be able to be done with an aftermarket tuner but that is costly and can affect the warranty. Of course you can go with a more aggressive tire that isn't taller and maintain speedometer accuracy. Speedometer accuracy may not be a factor for you but it is for me. Anyway, just an FYI.
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That's good information. I had thought about it, I'm not sure it's of much worry to me. I'll just use my GPS or Waze to get an idea of how fast i'm going so I know how much of an offset it is. I would guesstimate it to be around 5 mph difference, showing me going slower than actual speed, so I just have to be aware of that.
I agree it is not worth the money to recalculate it, besides being accurate to know how fast you are going what would be the purpose of someone really wanting it to be dead on?