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The Coetzees had plenty of cush on their 650b x 57mm Schwalbe G-One Allround tubeless tires. Dori and Andrew Coetzee's Ritchey Double Switchback Break Away Tandem. © Z. Schuster

The Coetzees had plenty of cush on their 650b x 57mm Schwalbe G-One Allround tubeless tires. Dori and Andrew Coetzee’s Ritchey Double Switchback Break Away Tandem. © Z. Schuster