Shimano low viscosity mineral oil creates a reliable and strong power curve in all temperatures and terrains The BL-M9220 features a new closer pivot point that follows the natural arc of your finger, while the 5-degree upswept lever blade and dialed reach adjust put the rider in a natural position to attack technical sections of trail Updated hose routing of the BL-M9220 levers offers a clean aesthetic I-SPEC EV compatible mount gives riders a wider adjustment range Dual diameter opposed 4-piston caliper design provides stable braking power and excellent modulation Enhanced caliper seals ensure a reliable bite point in all situations The XTR BL-M9220 Brake Upgrade Kit brings powerful 4-piston stopping and a stiff, race-tuned lever to aggressive trail bikes. Built for control and consistency, it’s a fast way to step up braking confidence when the terrain gets real.