MPH to RPM converter with G-force

Ever wonder how fast your tires are rotating at a cetain speed and at what G-force?
Here is where you can find out.
How fast is the car going (MPH) ?:

What is your rim size? (diameter):
   
Specify rim:

What size is your tire? (distance from rim edge to outside of tire - tread):
   
Specify tire:

The RPM for your tires at MPH is RPM, or RPS.
Also, your tire tread is spinning with a G-force of Gs.

   
I have updated this script to validate the form values as numeric only and
added a truncation function that will keep the answers to only 5 decimal places.
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