Shimano Thumb Shifter Gear Shifters 6 Speed Pair SL-TX50 These Shimano thumb shifters feature as original equipment on a number of bikes and would be an ideal replacement for worn of broken shifters. The right hand shifter is a 6 speed indexed unit fully compatible with shimano rear gear systems, with an optical gear display, to let you know which gear you are using. The left shifter features 3 step shifting and is compatible with triple chainsets. This kit also includes genuine Shimano inner gear and outer gear cables. Details 6 Speed RH Shimano thumb shifter with matching LH. Includes inner and outer gear cables. Left shifter features an inline cable adjuster. Fits standard handlebars. Weight: 283 grams (pair including cables).