Hardtail Mountain Bike -- 26 inch double layer aluminum alloy, charcoal gloss hardtail frame and 21 speeds to conquer the trails, the Stone Mountain is ready for outdoor adventures. 21 speed hybrid bike -- The indexed rear derailleur combines with the micro-shift twist shifter to deliver 21 speeds on-demand for uphill climbing, downhill riding, or pure acceleration. Sports wheel bicycle for outdoor -- durable steel frame backed, suspension fork handles bumps and dips for a smoother-feeling ride. Comfort bikes -- premium padded ATB saddle has stitched sides for lasting quality; alloy quick release provides easy seat height adjustment. Easy Assembly -- Assemble the remaining 20% by yourself. Includes all the tools you need for building and maintaining your own bicycle. Any problem pls feel free to contact us.