Shimano Rapidfire Plus XTR shift levers deliver quick and intuitive rear shifting for improved control out on the trail. The new I-SPEC EV lever offers a wide range of adjustments, including increased lever slide range and a 60-degree rotational angle. With a lightweight and compact design, the SL-M9100-IR lever continues to set the standard for mountain bike shifting. Details: Model No: SL-M9100 Series: XTR M9100 Weight 117 grams (22.2mm Clamp), 112 grams (I-Spec EV) Mount: 22.2mm bar clamp, I-SPEC EV Max multiple shifts (rear): 4 Front speeds: 2 Rear speeds: 12 Shifter type: Rapidfire Plus Compatibility: Rear derailleur: Shimano 12-speed rear derailleurs