- Model Compatibility : This bicycle rear derailleur is designed specifically for 10-speed SIS index variable speed drives. Ensure compatibility with your bike's gears before purchasing. - Installation Type : Confirm whether your bike's rear derailleur is a direct installation or hook-mounted type. This model features a direct installation method, simplifying setup for seamless performance. - Durable Construction : Crafted from high-quality steel, this rear derailleur is built to last. Its robust design resists deformation and damage, ensuring reliable operation during your rides. - Versatile Applications : Ideal for a variety of bicycles, including variable speed bikes, mountain bikes, road bikes, racing bikes, city bikes, and folding bikes. Whether you're commuting, cycling in the mountains, or competing in races, this derailleur enhances your biking experience. - Enhanced Performance : Achieve smooth shifting and efficient gear transitions. This rear derailleur ensures optimal performance, providing a better ride quality and enhancing your cycling experience. Use Cases: 1. Upgrade your mountain bike for more reliable gear shifts during challenging trails, improving your overall performance. 2. Equip your city bike for daily commuting, benefiting from the ease of shifting gears for fluctuating terrain and speeds. 3. Enhance your racing bike's performance by ensuring precise gear transitions, giving you that competitive edge. Make the most of your biking adventures with this high-quality rear derailleur, engineered for efficiency and durability.