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My road bike is a 1980 Claud Butler Sovereign 10spd tourer, and I can't get up the hills on it. Current drivetrain: Front Chainring: 35-50, no maker's name but the cranks are Silstar. 5 bolt, BCD 122mm Front Mech: Campagnolo Rear Cassette: 14-28 5spd Rear Mech: Campagnolo Rally 3rd Gen long...