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The Coetzees paired an 11-40t cassette with the 46/30t rings in the bikes rear drive. Dori and Andrew Coetzee's Ritchey Double Switchback Break Away Tandem. © Z. Schuster

The Coetzees used an 11-40t cassette with the SRAM Red eTap rear derailleur by adding a Wolf Tooth Road Link hanger. Dori and Andrew Coetzee’s Ritchey Double Switchback Break Away Tandem. © Z. Schuster