Not sure a weight obsession is really needed with these small differences.
Remember with Aluminum it's stiffness does not vary with the different grades of alloy type, or if it's forged and so on. It gets stronger, but not stiffer.
So a lighter wheel has to loose a bit of stiffness as it has a thinner gauge but better strength material. For a track wheel the stiffness can be very important, i.e. the tyre gets more support.
The best track wheel will be the one that has the design that gives the best balance between stiffness and weight, but it almost certainly wont be the lightest wheel.
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