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The Solo comes with 700c x 40mm Maxxis gravel tires. Rocky Mountain designed the frame to fit 650b x 2.20" tires as well. Rocky Mountain Solo gravel / adventure bike. © Cyclocross Magazine

The Solo comes with 700c x 40mm Maxxis gravel tires. Rocky Mountain designed the frame to fit 650b x 2.20″ tires as well. Rocky Mountain Solo gravel / adventure bike. © Cyclocross Magazine