17" tire gps mph?

444 Views 2 Replies 3 Participants Last post by  ryan69
I was going to get my trucks computer adjusted for my new 33" tires. I checked my speed at 120k(via GPS), it's now only 3k off. Any stock wheeled 17" owners out there able to GPS on cruise at 120k?
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No but, I bought a Speedometer Calibrator from Hypertech when I upgrade my stock 2500 to 35 inch tires. Pretty easy to use and I am not mechanic. Took a couple test runs of adjusting tire sizes but, my speedometer matches my GPS.

If this helps any.

A helpful hint. This device marries itself to your truck. It cannot be used on more than one truck.
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