Originally Posted by
colombo357
Cadence = Revs. With a 4:1 gear ratio, every rev of the crank = 4 revs of the wheel.
Car engines idle around 800 RPM and can redline up to 8000+ RPM. Humans can't quite match cars, but if you can crank at a modest 4,000 RPM, you will achieve 16,000 RPM with the wheel. Using 2100 mm circumference tires (typical 700-23C road bike tires), that's:
.0013 miles per revolution * 16,000 RPM * 60 minutes per hour = 1,252 miles per hour, close to twice the speed of sound.
I know I'm nit picking but you do realize you
divide to find mph, not multiply. That's why you might sometimes see mi/h, as in, division.
(Also, according to you you'd end up going 0.34 mph)