Shimano's Deore XT Dyna-Sys 10-Speed RapidFire Shifters are a long-time favorite that places triggers immediately under your forefingers and thumbs. The ergonomic positioning is further enhanced by two reliable ball-bearing units for a smooth, dependable short-throw action. With the 2-way release, you can pull the upper trigger with your finger or push it your thumb, giving you the ultimate in versatility. Furthering that versatility, the front shifter has a mode converter so you can switch it between 2- or 3-ring set ups. It also includes a removable Optical Gear display for heads-up monitoring of gear choices.