SRAM MRX 6 Speed Twist Shifter (Rear) 2:1 Shimano Compatible The MRX ergonomic shifter is the original Grip Shift shifter that has sold in the millions across the globe because of its entry level price & compatibiliy with DIRT & Shimano* derailleur systems it is now available with some of the new technology Ergonomic hex-profile shifter cover with soft density grip Sram composite construction Completely enclosed cables seal shifter from contaminates Easy cable change grip cover 6 speed DI.R.T. & Shimano* compatible