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The constant pi (3.14159) times the diameter will give you the circumference of the wheel. Divide that into the distance you want to go and that gives you the rotations.
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I think you got it right, what’s the problem?
Math
2.75 in. diameter wheels means 2.75pi or approx. 8.6394
1 revolution goes 8.6394 in.
To go one inch, spin wheel approx. 0.115748779 turns/revolutions or approx. 41.6695604 degrees
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Thank you, this was helpful.