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@TheBrick(Tommy)
If the diameter of a round blade is equal to that of the minor axis then the latteral flex will be approximately the same but the for and aft flex will be greater. By the same token if the diameter is equal to the magor axis the lateral flex will be less.
My guess is that on a track frame due to the nice smooth surface + no front brake you do not need the for and aft stiffness the same so the diameter of the round blade is closer to that of the minor axis rather than than major one. This may well be incorrect though, I'm just throwing it out there.
Thanks RPM