Question by eddieexpiggy: A bicycle odometer (which measures distance traveled) is attached near the wheel hub and is designed for ?
27 inch wheels. What happens if you use it on a bicycle with 24-inch wheels?

Best answer:

Answer by Andy J
The distance traveled in one rotation of your 24in wheel is 75.39in and the bigger wheel is 84.82in. So, when you are given a distance, you should multiply it by .8888 and it will give you the correct distance. The distance traveled by your 24 inch wheel is 88.88% of the 27 inch wheel.

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Question by ray of sunshine: how to calculate tire travel distance?
I am installing a speedometer on a bicycle and I need to know the distance in millimeters per one revolution of the wheel. My tire size is 28″ x 1 5/8″. I am not very good at math, can anyone tell me the answer?

Best answer:

Answer by Jonesy
I have no clue what those sizes mean cause I don’t know bikes (look at this team work!) but I am guessing 28″ is the diameter of the wheel and 1 5/8″ is the width of the wheel.

Anyways we will just need the diameter of the wheel to figure this out.

We need to take the circumference of the wheel which is the actual length of the tire if you laid it out flat or the distance your tire would go in one revolution

circumference = pi * diameter

So we simply multiple pi (3.14) * 28 ” and we get 87.92 inches (roughly since we only used 3.14 for our pi value and not the actual value of pi)

Now we need to convert inches to millimeters

1 inch = 25.4 millimeters

So multiple 87.92 inches by (25.4 millimeters/1 inch)

the “inches” in the equation cancel out and you are left with…

2233.17 mm per revolution

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