The Shimano Deore M4100/MT420 Bled Brake Lever/Post Mount Caliper are fully bled hydraulic disc brakes with an easily adaptable post-style calliper. The rear fully bled lever and calliper comes without adapters or rotors giving you the freedom to customise to suit your bike.Shimano Deore M4100/MT420 Bled Brake Lever/Post Mount Caliper FeaturesCan be used with the revolutionary Center Lock rotor system which fits easily to Center Lock compatible hubs; alternatively conventional 6-bolt rotors can be used all in a choice of 160 mm, 180 mm and 203 mmOpposed 4-piston design reduces leading effect and optimal pad wear increases braking controlTwo piece calliper design is both ridged and durableHinged clamp designErgonomic alloy brake lever for optimum comfort and performanceMineral oil brake fluid is non-corrosive and less hazardous than conventional hydraulic brake fluidShim-less mounting system allows for quick installation and setting upI-spec-EV compatibleBrake lever features reach adjustment for perfect custom fitThe kit also contains resin pads (can be used with sintered and Ice Tech pads), plus spare olives and insert should you wish to adjust the length of the cuttable hosesHose length 1700 mm