Features: Produced from powerful aluminum alloy, this mountain cycle gear reduces overall weight, ideal for remote motorcyclists to minimize fatigue and improve efficiency. Features a meticulously constructed gear structure that ensures smooth and seamless shifting, suitable for both mountain footpaths and city commuting. It might installed lacking additional parts, making it excellent for cycling enthusiasts searching to upgrade otherwise replace their derailleurs for upgraded execution. Sound device is dealt to resist oxidation from rain and mud, addressing damage and tear caused by harsh outdoor conditions and extending the product's existence. Simplistic installation steps allow for easy arrange lacking the need for professional tools, making it suitable for users with limited technical abilities to improve their bike's execution. Specifications: Aluminum alloy Size: Standard size design Model: Suitable for most mountain bike models Color: Silver, black and gray Process: Processing technology, that' s anodized to improve resistance Practicality: Supports multi-speed gear shifting, improves riding efficiency, and is suitable for cycling needs of various complex terrains Package Includes: 1 x Mountain Bike Aluminum Alloy Transmission 4 x Installation screw M5×10mm stainless steel screw 1 x Chinese and English bilingual installation guide note: Please allow 1-2cm errors due to manual measurement. Due to the differences betweeen different monitors,the picture may not reflect the actual colour of the item.