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Best Mountain Bike Aluminum MTB Bicycle 29 Mountain Bike. Aluminum Alloy Frame: Constructed with durable aluminum alloy for lightweight performance. Multiple Wheel Sizes: Available in 26 Inch, 27.5 Inch, and 29 Inch options. 21-Speed Gear System: Equipped with 21-speed transmission for versatile riding. Disc Brake System: Features 160mm disc brakes front and rear for reliable stopping. Customizable Colors: Available in Dark Gray, Light Gray, Green, Purple, or OEM colors. 5-Year Warranty: Comprehensive 5-year warranty coverage included. OEM Service Available: Over 18 years of experience in OEM bicycle manufacturing. CE Certified: Product meets CE safety and quality standards.