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Acker's carbon frame harkens back to the days of post mount disc brakes. Matt Acker's Salsa Warbeard. 2018 Gravel Worlds. © Z. Schuster / Cyclocross Magazine

Acker’s carbon frame harkens back to the days of post mount disc brakes. Matt Acker’s Salsa Warbeard. 2018 Gravel Worlds. © Z. Schuster / Cyclocross Magazine