Instructables

Step 8: Measure Your Wheel

Since you're only measuring how many times the wheel has turned, you'll need to know the circumference of your wheel to get distance your hamster runs. In case you've forgotten your high school geometry, remember the equation

circumference = pi * diameter

Use Google to get the circumference into your favorite units of distance.

 
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kP1 year ago
Or you could measure the outside with a fabric (cloth) tape (ruler).