This 24-inch adult mountain bike features a 21-speed drivetrain with clear gear indicators, a carbon steel frame, and reliable mechanical disc brakes. Assembled, the bike measures 65 inches long, 25 inches wide, and 36 inches high, weighing 44 pounds; packaged, it measures 52.36 inches long, 7.87 inches wide, and 27.95 inches high, with a total weight of 48.5 pounds. This rugged 24x16-inch steel-framed bike features an ergonomic frame design suitable for riders between 4'8" and 5'6" (56-66") tall, with a maximum load capacity of 250 pounds. The 21-speed drivetrain includes gear indicators. The mechanical dual disc brake system is simple in design and easy to maintain. This mountain bike is equipped with a front fork and dual rear shocks. The 24x2.125-inch all-terrain rubber tires offer strong puncture resistance, excellent slip resistance, and superior grip. The bicycle is 85% pre-assembled at the factory; you only need to install the handlebars, seat, front wheel, and pedals.