Tackle trails and choose rougher routes with confidence Tackle trails with this versatile 1x11-speed rear derailleur's seamless shifting and pedaling. Its low-profile design and chain stabilization give riders the confidence to choose rougher routes. Feature: Stable drivetrain performance on trails, gravel, and city streets Chain stabilizer reduces chain drop, slap and noise Low-profile design is optimized for rough terrain Total capacity: 39T Max low sprocket: 50T (1x11-speed), 48T (1x10-speed) Designed and tested to provide enduring e-biking performance E-BIKE RATED SKU: RD-U6000 ***These are OEM Shimano Parts, Brand new, Never Installed on Bike, Never used in any way, just NOT in retail packaging.***