Determine your Actual Vehicle Speed
Note: May not work with some versions of Mozilla
Crawl Ratio Calculator

Need to compute gear ratios for an appropriate vehicle speed?
Use this form to calculate your vehicle speed (approx.)
Unfortunately designed for Microsoft Internet Explorer

Note:

Tire size assumes that a 35" tire is exactly 35" in diameter.
Tread wear / over inflation will effect actual size under extreme conditions.
Also, a balloon factor will effect size at high velocities, so use this as a close approximation.