URL https://www.sicklines.com/2010/06/27/2011-shimano-xtr-m980/ Review of Shimano XTR M980 groupset. Tags Drivetrain Part type Drivetrain Groupset series XTR M980 Parts Shimano XTR M980 Rear Derailleur Part variations Shimano XTR M980 Rear Derailleur RD-M980-SGS