Rear derailleur pulley wheel for mountain bikes Durable and practical construction designed to withstand tough riding conditions and provide longlasting performance. Sealed steel bearings offer waterproof and dustproof protection, ensuring smooth and reliable operation in challenging environments. strength aluminum alloy body provides strong support and resistance to deformation under tension and stress, supporting performance and longevity. Colorteeth options available in black, red, blue, gold, and silver to suit your preference and style without compromising function. Function and advantages Improves drivetrain reliability with sealed bearings that resist contamination in wet or dusty riding conditions. Built to endure the stresses of frequent shifting and tension riding on mountain trails. Lightweight yet strong alloy construction to support durable performance over time. Aesthetic options allow you to the look of your bike while maintaining dependable functionality. Use scenarios Allweather trail riding: protect drivetrain performance on muddy, rainy, or dusty trails where exposure to the elements is common. Drivetrain refresh: upgrade aging pulleys for smoother shifting and improved longevity without changing other components. Bike : choose a colorteeth finish that matches or accents your bike's color scheme while preserving reliable pulley operation. Compatibility and notes This pulley is designed for rear derailleur systems on mountain bikes. Specific size and compatibility should be verified with your derailleur model and drivetrain configuration.