3TV
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- #3,541
I spent a few hours calibrating the speedometer on my 392 with a Tazr, so that it is accurate with 40" tires. The city installed one of those radar "slow down" signs about a mile from my house so I decided to use it to calibrate my speedometer. I had to program a tire size of 39.3" to get an accurate speedometer with my 40" Toyo MTs. Now when I pass the radar sign with the cruise control set at 50 mph, the sign reads 50 mph.
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