What does a gear look like? (GIF)

For every one rotation of Gear A, Gear B rotates twice. This means the gear ratio of this gear is 1:2

Gear ratios (Part 2)

What are gear ratios?

• The gear ratio is the ratio of the number of teeth on the chainring of the crankset to the teeth on the rear sprocket

Rear sprocket

Chainring

Crankset

A bicycle gear

Braking (Part 1)

-Braking uses friction
-Squeezing the levels on the handlebars send small metal cables, causing rubber shoes clamp onto the metal inner surface of the wheels
-This action turns the rider's kinetic energy into heat--slowing the rider down