The aluminum alloy rear derailleur guide wheel for mountain bikes is engineered for optimal performance. this derailleur pulley wheel ensures efficient and smooth gear changes, even on the toughest trails. Ideal for mountain biking, it enhances your bike's reliability and responsiveness. To use, simply replace your derailleur wheel with this , sturdy component. Features -Color:Black -Material:Aluminum alloy -Size:4.30X4.30X0.10cm/1.69X1.69X0.04in -Size: : 5mm ; thickness: 10mm -Lightweight and strong: the aluminum alloy construction provides a of lightweight and strength, enhancing your bike's performance - durability: engineered for durability, this derailleur pulley is built to last, even under demanding riding conditions -Wide compatibility: the derailleur pulley meet diverse cycling needs, from casual rides to intense trails -Versatile application: suitable for a wide range of mountain biking scenarios, this guide wheel adapts to different terrains with ease -Enhanced riding confidence: with reliable performance and smooth shifting, this derailleur pulley allows you to ride with greater confidence and peace of mind Package list: 1 x Derailleur Pulley 2 x Accessory