Here Is An Equation For RPM / MPH
#1
Here Is An Equation For RPM / MPH
Ok, so I did some digging and came up with the following equation.
Do the math to solve for the variable you need to.
Here are the variables:
MPH = MPH
RPM = RPM
pi = 3.14159
d = Tire true diameter (inches)
g = rear end gear ratio
od = final gear reduction for overdrive
The equation:
MPH = (RPM*pi*d)/(12*88*g*od)
Example:
My truck with 35" treads and the NV5600 transmission:
MPH = (RPM*pi*34.9")/(12*88*3.55*0.73)
So, driving at 60 MPH I see an RPM of: 1498 (rounded up).
This is a useful tool when determining the outcome of new tires on your truck. I am leaning hard toward the Toyo MT 35x12.5 (315x75x16)
Cheers,
Do the math to solve for the variable you need to.
Here are the variables:
MPH = MPH
RPM = RPM
pi = 3.14159
d = Tire true diameter (inches)
g = rear end gear ratio
od = final gear reduction for overdrive
The equation:
MPH = (RPM*pi*d)/(12*88*g*od)
Example:
My truck with 35" treads and the NV5600 transmission:
MPH = (RPM*pi*34.9")/(12*88*3.55*0.73)
So, driving at 60 MPH I see an RPM of: 1498 (rounded up).
This is a useful tool when determining the outcome of new tires on your truck. I am leaning hard toward the Toyo MT 35x12.5 (315x75x16)
Cheers,
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wildbill (06-21-2008)
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