This 21-speed adult mountain bike is built for urban commuting and off-road adventures, offering the perfect balance of performance, durability, and comfort. Featuring a carbon steel frame for strength, front and rear V-brakes for responsive stopping power, and a 21-speed gear system for smooth shifting, this bike handles city streets, gravel paths, and mountain trails with ease.The ergonomic saddle and anti-slip pedals provide a comfortable riding experience, reducing fatigue during long rides. The corrosion-resistant finish ensures your bike stays looking great and performing well for years.Ideal for both men and women, this hybrid mountain and commuter bike is 85% pre-assembled for quick and easy setup. Whether you’re looking for a fitness bike, road bike, or trail bike, this model delivers reliable performance and modern design. 21-SPEED GEAR SYSTEM – This adult mountain bike features a 21-speed transmission, delivering seamless gear shifts for uphill climbs, downhill descents, and city commuting. Perfect for both men and women riders. RELIABLE DUAL V-BRAKES FOR ALL-WEATHER SAFETY -Equipped with front and rear V-brakes, this 21-speed mountain bike ensures quick and stable stopping power on roads, trails, and mountain paths—ride with confidence in any weather. ERGONOMIC COMFORT NON-SLIP PEDALS – The ergonomic saddle reduces pressure on hips and spine, while textured anti-slip pedals provide a secure grip, even in wet conditions, making it ideal for long-distance trail riding or commuting. DURABLE CARBON STEEL FRAME – Crafted from high-tensile carbon steel, this mountain bike for adults is designed for durability and impact resistance, with a corrosion-resistant finish for year-round performance. 85% PRE-ASSEMBLED EASY SETUP – This adult MTB bike arrives 85% pre-built with clear instructions and tools, allowing quick assembly in 15-20 minutes. Includes optional training wheels for beginner riders.