This 26 inch mountain bike for adults is quite well-equipped. The bicycle frame made from solid aluminum alloy makes the whole MTB bike lighter at the same time ensures great durability for the bike. The 26″ large wheels and widened anti-skid tires provide a strong grip and are suitable for complex terrains. Equipped with a Shimano 21-speed drivetrain . the technical thumb toggle shift system allows you easily to choose the best gear for steep climbing. The hand bar is designed with an optical gear display indicator to clearly show you the gear position. A resistant mountain bike suspension fork and dual disc brakes guarantee a smoother and more comfortable ride. The mountain bicycle is equipped with multiple reflectors for safe night riding. 80% of the 21-speed mountain bike has been preassembled. Simply complete all the assembly . then conquer fields . grass . mountains . and beaches . go anywhere you want . and enjoy riding.