SPECIFICATIONSApplicable People: UnisexBike Suspension Types: BidirectionalBraking System: Double Disc BrakeBrand Name: NONEColor: BlueFork Material: STEELFrame Material: Carbon SteelHigh-concerned chemical: noneItem Code: W709P186917Material: SteelOrigin: Mainland ChinaProduct Type: Single Box ProductRim Material: STEELType: mountain bikeWheel Size: 26" [Steel Mountain Bike Suspension Frame] This mountain bike adopts a modern 26×17-inch steel suspension frame. It delivers outstanding shock absorption and brings smooth riding on mountain trails, forest lanes and paved roads. [Great Braking System] This mountain bike is equipped with practical, high-performance mechanical disc brakes to achieve accurate, controllable braking. Mechanical disc brakes outperform rim brakes. They provide safer riding during fast cycling, downhill travel and wet slippery weather. [Excellent Transmission] This bicycle features a mature 21-speed shifting configuration. Matched front and rear derailleurs support fast, smooth gear switching to adapt to diverse road surfaces. [26-inch Premium Tires] The bikes 26-inch tires are constructed with high-grade rubber featuring strong anti-puncture and wear-resistant properties. It fits multiple riding scenarios including mountain off-roading and daily city commuting. [Easy Assembly, 85% Pre-assembled] The bicycle is pre-assembled by 85%, with free pedals and installation tools included. Users can complete assembly effortlessly with tutorial videos. Professional support is available to solve any assembly issues.