The basic formula for the job goes like this: New tire size divided by old tire size multiplied by speedometer reading equals actual mph. Not that difficult, but it only works for your head. Your ...
Slamming your truck to get it in the weeds on low-pro rubber or jacking it up for big, knobby meats will throw your speedometer out of whack. Most custom-truck builders know this, but few do anything ...
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