RapidFire Plus shifters with 2-way release, multi-release and instant release technology for faster, smoother shifting* Multi-shift in both directions: up to 4 downshifts at once with thumb lever and up to 2 upshifts at once with index lever* Quicker lever access and light operation* 35% less shifting operation force and 20% quicker main lever access vs SL-M8000* Adjust to the optimal position for any riding style or rider preference with clean cockpit* I-Spec EV offers greater adjustability to the shift lever's position relative to the brake lever than previous I-Spec versions