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Wobick 05-06-2008, 05:35 PM i was just lookn for the formula to go from the engine rpm, to tire speed exapmle. rpm X gearratio X final Dive X Diff / tire size.......is this right? Q101ATFD 05-06-2008, 05:58 PM You kinda have it right. The formula below gives you the road speed: [ [Engine RPM / Transmission Gear Ratio / Rear End Ratio] x Tire Circumference] x 60 / 12 / 5280 [Engine RPM / Transmission Gear Ratio / Rear End Ratio] gives you the tire's RPM Wobick 05-06-2008, 06:22 PM thanks Q101ATFD 05-06-2008, 06:29 PM Figures, the time I don't specify, I'm taking to a metricist... The given formula was for MPH, and called for the circumference in inches... BHoward6.6 05-06-2008, 06:30 PM i was just lookn for the formula to go from the engine rpm, to tire speed exapmle. rpm X gearratio X final Dive X Diff / tire size.......is this right? Heres a good one~http://www.snoman.com/HTML/axlecalc_5a.html | ||