Product details Lightweight aluminum mountain-style frame with hydro-formed tubing and front suspension fork for a durable, responsive ride that can take on rugged trails. 21-speed trigger shifters supply a wide gear range and quick, precise shifts. Front and rear mechanical disc brakes deliver all-condition stopping. High profile alloy rims add lightweight strength and durability without weighing you down. 27.5-inch wheels fit riders 64 to 74 inches tall. This bike comes ready to be assembled and includes a limited lifetime warranty for as long as you own the bike.SpecificationsBrand:SchwinnBicycle Type:Mountain BikesBicycle Wheel Diameter:27.5\”Age Group:AdultNumber of Speeds:21 SpeedColor:GrayFrame Material:AluminumAssembled Product Dimensions (L x W x H):71.13 x 28.30 x 41.27 Inches