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Simple and exact test for tire circumferences discrepancy
Posted 02 November 2003 - 03:30 PM
Found it difficult to directly measure the tires circumference using a tape. You have to measure exactly at the same place on the tire, and be sure the tape goes straight around the tire, etc.
This morning I went at a college parking lot, measured that 13 parking spaces were equivalent of about 20 tire revolutions. I put a chalk mark on front and rear tires at the point of road contact and proceeded to give them the 20 revs going in a straight line.
If the tires circumferences had a difference of 1/4 inch or more I would find the marks 5 or more inches apart at the end of the experiment.
They were nor more than 1 inch from each other relative to the tire's contact patch.
My mind is now at ease: my viscous coupling is not in danger.
I might try something else next time and measure what effect a difference in pressure does to the rolling radius of a tire. T'was to cold to add that to the experiment this morning.
My contribution to car science :santa:
Please, no Nobel prize necessary.
Posted 02 November 2003 - 03:38 PM
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