The MRX ergonomic shifter is the original GripShift shifter that has sold in the millions across the globe, because of its entry level price and compatibiliy with DIRT and Shimano* derailleur systems it is now available with some of the new technology2:1 actuation ratio and SRS technology for light precise indexing3 / 5 / 6 / 7 / 8 speedIndexed rear shifter micro front shifterEasy cable change