Side swing, side pull SLX 12-speed double front derailleur decrease problems with tyre clearance and reduces cable friction Designed specifically with modern trail bikes in mind, Shimano side swing technology front derailleurs increases tyre clearance by 15mm, while new cable routing resulting in the lightest shifting action yet 12-speed MTB drivetrain compatibility Specifically developed for 68, 73 mm and press fit 92 bottom bracket shells, with a 48.8 mm or 51.8 mm chain line 36-38 tooth outer ring compatible For 66-69 degree chainstay angle