Steel mountain-style frame and front suspension fork supply a durable, responsive ride21-speed twist shifters and Shimano rear derailleur provide a wide gear range and quick shiftsFront and rear linear pull brakes provide crisp, efficient stoppingKnobby tread mountain tires are designed for the trailLight and strong alloy rims add durability without weighing you downTool-free adjustable seat post for easy height adjustments on the go