Model: 2 x 7 speed R7; 3 x 7 speed R7; 2 x 8 speed R8; 3 x 8 speed R8;2 x 9 speed R9; 3 x 9 speed R9 2 x 10 R10 ;3 x 10 R10 ;2 x 11 ; 3 x 11; Applicable handlebar caliber: about 22.2-23.8mm/ 0.87-0.94and x27;and x27; Adaptation: for the road bike brake core; bend handle bar, horn handle bar, aircraft handle bar, cleat handle bar for road bikes Compatible with the derailleur front and rear shifter of the bicycles, including the micro-rotation, forShimano, etc. Item Specifications Cassette Compatibility: 7/8/9/10/11 Speed Front Shifting :Double/triple Bracket Material :Engineering Composite Brake Lever Material :forged aluminum / anodized Shift Cable :stainless slick Weight :530g Packaging include 1 Pair Shifters .(Left and Right ) include 1 Pair Cable 2 x 7 speed 3 x 7 speed 2 x 8 speed 3 x 8 speed 2 x 9 speed 3 x 9 speed 2 x 10 speed 3 x 10 speed 2 x 11 speed 3 x 11 speed 2 x 7 Groupset for shimano road bike double 7 speeds Item Specifications Model No. SB-R472 (2X7S)/FD-R52F/RD-RD52S Cassette Compatibility: 7 Speed Front Shifting :Double Bracket Material :Engineering Composite Brake Lever Material :forged aluminum / anodized Shift Cable :stainless slick Compatibility for Shimano 7 Speed Road Rear Derailleur Packaging include 1 Pair SB-R472(2X7S) Shifters .Left and Right 1 Pcs FD-R52F Front Derailleur 1 Pcs Rear Derailleur RD-R52S 7 Speed (Short Cage)