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Theoretically this is it (you just have to take ratio of diameters, BTW), however, there will be errors in measurement because of rubber wheels, they will squeeze and the ratio will depend on pressure..
I think it is better to measure how many ticks it takes for full rotation of the shaft (or 90°, I used bubble level for this.. this is how I found out the numbers, it is easy if you are using Bartel's software).
Try and find old printer with timing belt, this is the best
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