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Suitable for 39, 40 and 41 teeth main gear wheel. Diameter 38.7 mm Bore 10 mm Total width 18 mm Tooth width 11.5 mm Module m=1.5 Profile regraded , this means that the number of teeth is changed while the diameter remained constant. The part of the involutes? curve that defines the tooth profile is changed. Positively regraded (lower number of teeth) pinions are stronger and run smoother, the reduced strength of negatively regraded pinions doesn?t really matter
