Like, on a mountainbike you have two levers, one for the index finger and one for the thumb. why does on the right side the index give a “harder” gear and on the left the index finger lever give a “easier” gear? couldn’t they both give high and low gear in the same direction?
In: Engineering
Take a fraction like 13/5.
You can make it larger by increasing the first number (eg 15/5) or decreasing the bottom number (eg 13/3).
A bike gear system is this ratio principle. More thumb work to increase the front sprocket. More thumb work to decrease the rear sprocket.
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