a 5-speed bike has the following gear ratios:

a) 3 : 7

b) 1 : 2

c) 3 : 10

d) 4 : 7

e) 6 : 17

put these ratios in order. smallest to largest

a

7 cog back wheel (rear sprockets, hub gears) and

2 cog pedal wheel (shifters, chain wheels) have the following numbers of teeth:

pedal wheel: 42 or 53 teeth

cog wheel: 13, 15, 17, 19, 21, 23 or 26 teeth

how many different ratios can you effectively get from the 14 combinations?

it isn't 14 because some ratios are too close together to be called different

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