The KQi3 Max features a patented dual brake caliper made from aluminum die-cast alloy, ensuring extremely short braking distances and excellent heat dissipation. The legendary red finish makes a Niu stand out. Self-healing tires automatically seal when punctured, preventing flat tires and making your ride worry-free. Niu's patented folding mechanism is safe and easy to use. Simply fold it together and apart with a single motion. Just step on the brake and let the state-of-the-art regenerative braking technology (the same technology used in premium sports cars) take care of the rest.