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The Coetzees ran a rear wheel built around a SunRiggle Helix TR27 SL rim and DT Swiss hub. Dori and Andrew Coetzee's Ritchey Double Switchback Break Away Tandem. © Z. Schuster

The Coetzees ran a rear wheel built around a SunRiggle Helix TR27 SL rim and DT Swiss hub. Dori and Andrew Coetzee’s Ritchey Double Switchback Break Away Tandem. © Z. Schuster