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Old 03-24-2013, 05:25 PM   #8
yurtle
Gone Mad
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Join Date: Oct 2009
Location: Buford, GA
Posts: 8,988
Default Re: riddle me this Batman

This is something I've been noodling since I bought my Alltrax ExRay.

If I measure from ground to centerline of the wheel/tire, I get one radius. If I measure from the centerline to the top, I get a different radius. If I measure from side to side, I get a third dimension. I considered using a cloth tape, and measuring the circumference, but even that may not be accurate, as the middle of the tire may bulge more on the sides and top than it does on the bottom.

Ultimately, the best way to measure the "tire diameter" is to make a chalk mark on the side of the tire and the pavement. Drive several revolutions (the more the better) then measure the distance. Distance / revolutions = circumference.

Thoughts?
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