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JVBulman-
DA 10 is so underrated
How so? Even without the compatibility issues, it's a shit idea. Given the low speed and the fact that wear rate and chordal action are not a serious problem for track racing, and that the desired fine-grained ratio adjustment can be accommodated with 1/2 tooth increments on both chainring and sprocket, double pitch chain looks like a potential route to efficiency gain, i.e. the exact opposite of Shimano's vainglorious blunder.
gbj_tester
1958? wow !