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The Coetzees installed a SRAM Red eTap rear derailleur on the rear drive side. Dori and Andrew Coetzee's Ritchey Double Switchback Break Away Tandem. © Z. Schuster

The Coetzees installed a SRAM Red eTap rear derailleur on the rear drive side. Dori and Andrew Coetzee’s Ritchey Double Switchback Break Away Tandem. © Z. Schuster