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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Not sure, but after I put on my 33's I was 3kmh over just like you are.
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