Rotating spline

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A spline is one of a series of ridges on a driveshaft which mesh with and equalize the rotation speed of a mating piece, thereby transferring torque. For instance, a gear mounted on a shaft might use a male spline on the shaft that matches the female spline on the gear.

Bicycle crank interfaces that are splined include ISIS Drive and Shimano's Octalink.

Manufacturers typically cut splines with a broach.

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