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The Coetzees used 42t rings and Race Face Forged cranks on with the timing chain. Dori and Andrew Coetzee's Ritchey Double Switchback Break Away Tandem. © Z. Schuster

The Coetzees used 42t rings and Race Face Forged cranks on with the timing chain. Dori and Andrew Coetzee’s Ritchey Double Switchback Break Away Tandem. © Z. Schuster