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Rocky Mountain claims the Solo 50 has clearance for 650bx2.20" tires. It comes with 700x40c stock. Rocky Mountain Solo gravel / adventure bike. © Cyclocross Magazine

Rocky Mountain claims the Solo 50 has clearance for 650bx2.20″ tires. It comes with 700x40c stock. Rocky Mountain Solo gravel / adventure bike. © Cyclocross Magazineundefined