Join Date: Nov 2010
Location: Deep South
Bikes: Cannondale SR's and ST's from the '80's
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If you are referring to the saw-tooth shape of the indexing spline tabs, it is of no concern. The teeth are square at the lead edge, that is all that matters.
Evidently it is due to some engineering solution to a manufacturing problem that is not apparent to us peons, probably due to the displacement of the metal in stamping the integral spacer into the shape of the cog.
As long as you are applying torque in a forward direction, there is no problem.
However, I would not recommend using this cog in fixie applications. Then it WOULD matter!