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Andrew set the SRAM Red eTap derailleur up with "super compact" 46/30t rings on the two inner chain rings of a Race Face Forged triple crank. Dori and Andrew Coetzee's Ritchey Double Switchback Break Away Tandem. © Z. Schuster

Andrew set the SRAM Red eTap derailleur up with “super compact” 46/30t rings on the two inner chain rings of a Race Face Forged triple crank. Dori and Andrew Coetzee’s Ritchey Double Switchback Break Away Tandem. © Z. Schuster