There are some good combinations for 52-42. One popular choice was 14-16-18-21-24; another, for the truly hard-core, was 14-15-16-17-18. I have much better luck with either 52-44, 50-42, or 48-40, because these work so nicely with a 2-tooth progression in back. You might like my mountain bike gearing: 48-40-24 / 13-15-17-19-22-24-26 (or 28)
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069