For people that would like to run existing 11-speed Shimano that have Ispec II on the new Shimano XTR 9100 brakes it is very doable. You need to remove the Ispec II bracket from the 9000 shifter and then it will bolt directly to the new 9100 brakes into the ispecEV square nut, and the only real mod will be using a slightly shorter screw so it does not go through the square nut and hit the handlebar. Main difference between the two shifters is the 9100 shifter has .775 side to side travel/play and the existing Ispec II levers only have .680. The picture is with 9000 brake and 9100 brake both with 9000 XTR shifters. The range of motion up and down will be more with the 9100 brakes, but they both go down the same amount and only the 9100 brake lets it move up much higher than the 9000 almost to the point where its almost 90 degree to the ground.