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weisy Module is 0.52 Module is Reference diameter divided by teeths, but this diameter is the outer diamter (21 T :12mm D) - the reference diameter is about 11mm - then 11 divided 21 = 0,5221 T: 12mm diameter 22 T: 12.5mm 23 T: 13mm 24 T: 13.5mm 25 T: 14mm
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