An imaginary circle concentric to a toothed wheel, along which the pitch of the teeth is measured.
- The velocity ratio is equal to the inverse ratio of the diameters of pitch circles.
- The hypoid gears used in conventional axles do not have a true pitch circle since both sliding and rolling occurs at the teeth and the gears could not be replaced with frictional disks.
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Syllabification: pitch cir·cle
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