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Multiply the pitch by the teeth and that will give you the circumference. If you want to know the diameter then divide the circumference by Pi.How much is significant? Do you know the difference in diameter from the 7 to the 8 tooth? I don't...
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7 tooth is 3x7 =21/3.141=6.685
8 tooth is 3x8 =24/3.141=7.64
So about an inch at diameter and 1/2 inch at radius.