Durable and Reliable: The rear derailleur pulley is made from high-strength plastic material, capable of withstanding heavy loads and impacts, providing a long service life. The rear derailleur pulley guide roller is precisely processed for smooth contact with the chain, ensuring stable performance, low noise, and reduced wear. Accurate Positioning: The guide wheel effectively controls the direction and position of the chain movement, helping prevent derailment or misalignment and ensuring consistent drive performance. Wide Speed Range: The rear derailleur pulley features an adjustable conical design, allowing for a range of speed adjustments to meet the drivetrain requirements of various bicycles. Wide Application: The rear derailleur pulley is easy to install without the need for complex adjustments or maintenance, making it suitable for use in various bicycle types, including mountain bikes, road bikes, and standard bicycles. Specification: Material: Plastic Applicable: Mountain Bike / Road Bike / Bike Size Chart: 11T: 4.4cm x 4.4cm x 0.8cm / 1.73 inch x 1.73 inch x 0.31 inch 12T: 4.9cm x 4.9cm x 0.8cm / 1.93 inch x 1.93 inch x 0.31 inch 13T: 5.3cm x 5.3cm x 0.8cm / 2.09 inch x 2.09 inch x 0.31 inch 14T: 5.8cm x 5.8cm x 0.8cm / 2.28 inch x 2.28 inch x 0.31 inch Package Includes: 1 x Rear Derailleur Guide Pulley Note: 1. Please allow slight measurement deviation due to manual measurement. 2. Due to differences in monitor displays, the actual color of the item may vary slightly from the images shown.