Features: High-Quality Metal Bearings: Our road bike guide pulley features durable metal bearings that provide smooth and reliable performance even in tough conditions. Multiple Tension Stress Wheel Options: Choose from 11t 12t or 13t tension stress wheel options to customize your bike's performance and achieve optimal shifting. Lightweight And Durable POM Construction: Our pulley gear is made from lightweight and durable pom material which provides excellent wear resistance and reduces friction for smoother operation. All-Black Anti-Corrosion Coating: Our guide pulley features an all-black anti-corrosion coating that provides long-lasting protection against rust and other types of corrosion ensuring your bike stays in top condition. Easy Installation: Our steel guide pulley wheel is designed for easy installation so you can quickly and easily upgrade your bike's performance without any special tools or expertise. Specifications: Diameter: 44mm for 11T/49mm for 12T/53mm for 13T/58mm for 14T Material: Plastic/nylon fiber/POM Applicable to: Mountain bike/road bike/bicycle Specification: 11T/12T/13T/14T Weight: 12g of 11T; 12.5g of 12T; 13g of 13T; 13.4g of 14T Color: Gold/Silver includes: 1 * Guide Gear "