XLE 11 RD-M665M (11 SP) MEDIUM CAGE - Rear derailleur. - Mountain bike. - Model No.: RD-M665M. - Cassette Compatibility: 11 Speed. - Cage Type: Medium Cage. - Front Chain ring: Single. - Max. Sprocket: 40-46T. - Min. Sprocket: 11T. - Total Capacity: 41T. - Chain Stability Mechanism (Clutch): Yes. - Guide Pulley: Engineering Composite with Steel Bushing. - Tension Pulley: Engineering Composite with Steel Bushing. - Bracket Body: Black Painted Aluminum. - Bracket Pivot Seal: Yes. - Plate Body: Resin/Black. - Plate Pivot Seal: Yes. - Outer Link: Forged Aluminum/Black Anodized. - Inner Link: Black Painted Aluminum. - Link Pin Bushing: Stainless Steel. - Outer Plate: Black Painted Steel. - Inner Plate: Black Painted Steel. - Weight: 373g. - Compatibility: Shimano 10/11 Speed MTB Rear Derailleur Compatible.