Shimano Ultegra RD-R8150 Di2 12-Speed Rear Derailleur Releases Why We Make ThisYou wouldn’t

Why We Make ThisYou wouldn’t make your own pasta from scratch and then pour jarred sauce on it

Twist Buster 2 line twist reduction

Pure Beam Focusing OpticsThe Pure Beam Focusing Optic combines our largest Ultra View Flood Beam with the Bulls-Eye Spot Beam making either up close or downrange illumination highly effective

Proprietary HangTight™ internal stabilizing and gear-hanging system improves structural integrity and allows for easy 360 degree hanging of headlamps

Inside compartment to keep your valuables safe

Shimano Ultegra RD-R8150 Di2 12-Speed Rear Derailleur Releases Why We Make ThisYou wouldn’tXTR Rear Derailleur Medium Cage SHIMANO SHADOW RD+ 12 speed The XTR M9100 series of derailleurs brings a new level of drivetrain silence thank to decreased tension in the low gear position and an added bumper on the pulley cage. Larger 13T pulleys increase efficiency and chain management while compatibility with SHIMANO's new 12 speed cassettes boosts range. FEATURES Enhance shifting performance Optimized for new drive system Silent drivetrain