MPH to Tire RPM and G-Force

How fast is the car going (MPH) ?:

What is your rim size? (diameter):
12 inches 13 inches 14 inches 15 inches 16 inches 17 inches 18 inches 19 inches Other (specify below)
Specify rim:

What size is your tire?
(distance from rim edge to outside of tire - tread):
2 inches 3 inches 4 inches 5 inches 6 inches 7 inches 8 inches 9 inches Other (specify below)
Specify tire:

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