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Shimano CX77 mechanical disc calipers mounted to the IS mounts using SM-MA-R203P/S adapters. Dori and Andrew Coetzee's Ritchey Double Switchback Break Away Tandem. © Z. Schuster

Shimano CX77 mechanical disc calipers mounted to the IS mounts using SM-MA-R203P/S adapters. Dori and Andrew Coetzee’s Ritchey Double Switchback Break Away Tandem. © Z. Schuster