Here's a site that has calculators for gear ratio, tire size, etc. (www.4lo.com)
It comes in handy for the mathematically impaired like myself.
Jeff Street
'55-2 short/step "Street's rod project"
MLayton324@aol.com wrote:
> RPM = V / D x GR x 334.2
> Where:
> V = vehicle speed in mph
> D = effective tire diameter
> GR = gear ratio (e.g., for my truck, 4.10 rear x .70 overdrive = 2.87)
>
> the above formula on the chevy truck sit does not seem to work out what am
> i doing wrong
>
> 55 mph/ 27 inch tire is 2.03 2.03 x 4.10(gear ratio) x 334.2 equals 2781
> which is supposed to be rpms at 55
>
> if i was only turning 2800 at 55 i would be estatic i cant even get it to
> 55 without feeling like its gonna blow help??
>
> thanks mike layton
> 50 3100
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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