If you feel so inclined, he says, you can count up the teeth on all the cogs, front and rear, and make a small table of the ratios. "For my bike (with 28, 39 and 48 teeth on the front and 13, 14 ...

No vehicle, not even your own feet, can take you farther with less energy than a bike. And when a bike has multiple gears—two or three chain rings up next to your pedals and up to 11 cogs on ...