I don't know about the blades shape but I believe they are much shorter also. alot of track bikes I have seen there is little clearance between the tire and crown and also the crown itself is shorter and not drilled.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk