Does anyone have the formula to calculate mph when rpm, final gear ratio and tire diameter are known?

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Tom Parsons

Try these, sometimes sites work sometimes they don't.

http://www.volkswagen.org/tiresize.htm

http://mindspring.com/~johnbolton/mphrpm.html


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69ht383>Smokumchevy
TC member#610
Smokum's '69 pics (http://www.cartogra.com/home/ViewMyAlbum.asp?coll_id=199357)
My Homepage (http://www.smokumchevy.homepage.com)

DZ,

Try this. I did the math myself... for fun.


MPH = RPM * (C / G * 1056)

C = (2*pi*r) = circumfrence of rear wheel
pi = 3.14159
r = radius of tire (or 1/2 diameter)
G = rear end ratio


This math is for a 4speed car in direct drive 1:1. This formula can also be switch around to give you engine speeds at various ground speeds if you wish

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??michael j Team Chevelle Gold #77
70 Chevelle SS396 4sp, Fathom Blue/White Stripes - Canadian built

Sir, Wes Vann's tech pages have all the formulas, click on this link, I believe it's item #24.

www.chevelles.com/techref/index.html (http://www.chevelles.com/techref/index.html)

Thanks all.

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Tom Parsons

We have a few neat programs available here on TC. Created by Jefferey Kennebeck.

http://www.chevelles.com/images/speed.jpg

Free for downloading.
Link: http://www.chevelles.com/shop/programs.shtml

[This message has been edited by Al (edited 04-26-2000).]

OUTSTANDING!

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Tom Parsons