Hi Dana, I also use and recommend Tsubaki Omega o-ring chain with a
rivet master link. The 520 size for racing bikes has been traditional
since about the '20s because the chain and sprockets are lighter,
strength is the same, and wear is not a consideration. Theoretically
the heavier 530 chain and sprockets would represent more inertia(thus
resistance) when accelerating the bike, probably in practice there would
be no perceptible difference considering the much bigger weight of the
wheel that also has to be accelerated. Bill
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