Shimano has made some updates to the XTR brakes, promising better modulation and more power. They’ve also got two versions, one with a four-piston caliper (M9120), and one with a two-piston caliper (M9100). It probably goes without saying that the four-banger is targeted to the enduro crowd, and the two-piston targeted at the XC riders demanding lighter weight (you’re on the M9120 model right now). The M9120 offers up a tool-free lever reach adjust knob, as well as the Free Stroke pad contact adjustment. Both of these adjustments are omitted on the M9100 in an effort to maximize weight reduction – however, the M9100 does still offer a tooled reach adjust. The M9120 brake caliper features an adjustable-angle banjo on the hose mount, and the hydraulic line is routed to the inboard for a very clean look. Bleed parts are top-facing for easy access.
The innards of the master cylinder remain roughly the same as Shimano’s previous XTR brakes. The mounting split-clamp has been moved inboard, allowing for more room between your brake clamp and grip.
The Ice Tech Freeza rotors make their return to the new XTR lineup, and they certainly look the part. Very clean and pro look, and Shimano claims they dissipate heat 20% quicker than the previous Freeza rotors.
