Genuine Shimano SL-TX30 3/6/7/18/21 Speed Shifter Set MTB Mountain Bike Gear-OE
Compatible with Shimano 7-speed rear derailleurs, ideal for 7-speed or 21-speed systems. Ideal for mountain bikes, folding bikes, and more. Optical Gear Display : Clearly shows the current gear while riding, making shifting more intuitive and reassuring.