Multi-Speed Fast Shifts: This folding mountain bike has three gears and the 21-speed system offers flexible riding options, ensuring you always find the easiest speed for efficiency. Balance Riding Comfort: The ergonomic, adjustable seat adjusts to your body's unique needs and complements the carbon steel frame to provide stability and resilience, and the padded shock absorbers help absorb vibrations, which greatly improves ride comfort and ensures a pleasurable ride every time. Hard-Wearing Tires & Brake System: The mountain bike tires are made of high-quality wear-resistant material and have a good grip, which can effectively prevent punctures and improve puncture resistance, making your ride more safe and comfortable. The dual-disc brake system provides a better braking effect and is more sensitive and reliable. Easy to Fold and Portable: Equipped with quick-release clips that help fold the bike quickly for quick and easy use in any place. Time-saving installation process: This mountain bike is designed 90% pre-assembled to save you time and trouble. The installation kit includes all the necessary tools and instructions.