Bicycle Warm Up Avctivity Page 4

We say that the ratio of the number of teeth in the front gear, to the number of teeth in

the rear gear, is equal to 24:12. When we put this ratio in simplest terms, we call it the

“gear ratio.” Therefore, this 24:12 ratio represents a gear ratio of 2:1.

6. If the chain is on the 24 tooth front gear, and on the 8-tooth rear gear:

a. What is the gear ratio?

b. How many times does the rear wheel go around when the pedal goes

around once?

c. Will this combination result in a higher speed than the 2:1 gear ratio?

Justify your answer.

7. Complete the table below with the gear combinations for the bicycle that has

two gears in the front, one of which has 30 teeth and the other 24. And five gears

in the back have 8, 12, 16, 20, and 24 teeth.

# turns of

ratio of

# teeth in

wheel for

# front teeth:

(gear ratio)

front gear

rear gear

each turn of

# rear teeth

pedal

24:8

3:1

24:12

2:1

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