Rear Derailleur Pulley Bicycle Pulley 13T Wheels,MTB Aluminum Alloy Roller,Pulley Guide Pulley Pulley,Bicycle Rear Derailleur Pulley Guide,for Mountain Bike and Road Bike Color, style and size: silver , 13 teeth, rear derailleur screw hole: 5mm. Lightweight and durable: The wheels of the bike rack are made of aluminum alloy, which is light and durable, and can also reduce drag and improve driving efficiency. Scope of application: This product is suitable for 13-tooth manual transmission bicycle rear derailleur accessories, used for chain transport and shifting on the chain changer. Installation: A pulley kit is an accessory or replacement part that can be easily installed with an Allen key by simply removing the screws that secure the part to the derailleur. Adjust the new pulley to the size of the screw (5mm) using the accessories provided. It must have a certain range of movement with the derailleur (do not overtighten as this will increase friction with the pulley and reduce its performance.) Anti-rust: anti-rust and anti-corrosion materials ensure long service life, durable machined and anodized bike support wheels ensure smooth operation. Features: Bike Accessories: Bike Pulley Support Wheels are an essential accessory for your bicycle, they will bring you a better riding experience. Durable: The roller pulley is made of aluminum alloy and ceramic. The aluminum alloy frame is rust and corrosion resistant, and durable. Visually appealing colors: Fine workmanship and paintwork make your bike stand out.