microSHIFT Left Thumb Shifter - MTB, Double/Triple, Friction, BlackSometimes simple things are better. No matter what kind of riding you do, or what kind of drivetrain youre using, these retro futuristic friction left thumb shifters deliver an intuitive, straightforward user experience. Whether youre touring remote wilderness areas or riding around the neighborhood, you wont miss a shift. Friction left side shifter compatible is with MTB double and triple front derailleurs Innovative torque bolt allows shift effort