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The Solo 50 has a SRAM Apex 1 rear derailleur and 11-speed XD cassette, which is a rare pairing. Rocky Mountain Solo gravel / adventure bike. © Cyclocross Magazine

The Solo 50 has a SRAM Apex 1 rear derailleur and 11-speed XD cassette, which is a rare pairing. Rocky Mountain Solo gravel / adventure bike. © Cyclocross Magazine