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 engineered for smooth chain contact, ensuring stable performance, low noise, and reduced wear. Accurate Positioning: The guide wheel effectively controls the chain's direction and position, preventing misalignment or derailment, ensuring consistent and reliable drive operation. Wide Speed Range: The rear derailleur pulley features an adjustable conical design, enabling a range of speed adjustments to meet the transmission requirements of various applications. Wide Application: The rear derailleur pulley is easy to install without complex adjustments or maintenance, making it suitable for use in various mechanical drive systems such as textile, packaging, and printing machinery. 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 monitor display differences, the actual color of the item may vary slightly from the images.