Handlebar: Carbon steel small swallow handlebar, plastic-sprayed, wall thickness 1.2mm Brake Lever: Engineering polymer material, with power cut-off function Brake Cable: Black copper cap, molybdenum disulfide lubricated Disc Brake Caliper: Full aluminum Disc Brake Rotor: 160mm card type Throttle: Key switch, 3-speed adjustment Handlebar Head: Small square head, full aluminum Headset: Mountain bike 8-piece headset Mountain King Front Fork: Head tube 28.6mm threadless, wall thickness 1.2mm, argon arc welded Outer Tire: 12" × 2.125" pneumatic tire Inner Tube: 12" × 2.125/2.30", full copper valve stem, Schrader valve Front Wheel Assembly: Reinforced polypropylene integrated wheel, with ball bearings Rear Wheel Motor: Custom TANK-150 type, right outlet, 150W high-power brushless geared motor, speed 550RPM, voltage 24V, gear ratio 1:4.5, rated torque 45N·m, tested under 25kg load: 1st gear 8km/h, 2nd gear 13km/h, 3rd gear 18km/h Frame: Carbon steel, wall thickness 1.2–1.4mm, argon arc welded Foot Pedals: Engineering polypropylene, thickness 4mm Saddle: High-density sponge foam, leather cover, polypropylene base, one-piece molded Kickstand: Custom sealed spring type Battery Box: Virgin polypropylene material Controller: All-terrain sine wave controller, model JR350W Lithium Battery: Model LN244.5, 22.2V 4Ah, range approx. 20-25km Lead-Acid Battery: 24V 3.5Ah/20HR, range approx. 15-20km Charger: 29.5V — 0.8A Surface Coating: Powder coating