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The tandem has a 68mm BSA threaded BB. Co-Motion was one of two companies showing off a gravel tandem at 2019 NAHBS Sacramento. © A. Yee / Cyclocross Magazine

The tandem has a 68mm BSA threaded BB. Co-Motion was one of two companies showing off a gravel tandem at 2019 NAHBS Sacramento. © A. Yee / Cyclocross Magazine