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On 4 Apr 2004 at 21:52, John Jaranson wrote: > Anyone know for sure what the sidewall percentage is? I think it varied with the manufacturer and the tire size. I've seen anywhere from 80% to 88%. You can't really measure a tire and get a practical number. The dynamic rolling circumference is different from the static. That's why driving the mile (km) is the better method. In Petri's case, with a mi/hr speedo in a metric country, he should keep in mind that 37.5 mi/hr = 60 km/hr. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org