21-Speed Mountain Bike for Adults with 24-Inch High-Carbon Steel Frame, 100mm Front Suspension and Dual Disc Brakes for Reliable Trail Performance

High-carbon steel frame (24x16") supports 250 lbs riders with rugged trail stability, featuring reinforced welds for long-lasting durability 21-speed thumb shift system paired with dual disc brakes delivers smooth gear changes and reliable stopping power on rough terrains 100mm front suspension fork reduces shock impact for riders 4'2"-4'9", maintaining comfort during multi-hour trail adventures 24x2.125" puncture-resistant tires with aggressive tread patterns improve traction on dirt, gravel, and pavement surfaces 85% pre-assembled design requires only 15-minute setup - install handlebars/saddle/front wheel/pedals then adjust brakes/gears