The OneUp Rear Freehub Shimano MS is designed for OneUp Rear Hubs and offers compatibility with various drivetrains, including XD/XDr, Hyperglide, and Microspline. It features durable Enduro 6903 bearings for smooth performance. The drive side end cap is included for easy installation, and a pre-installed spacer allows for quick switching between XD and XDr setups. This freehub is ready to enhance your cycling experience immediately. SKU: 1C0738.