New Model Four-piston Hydraulic Disc Brake M840 Material: alloy aluminium Weight: about 543g Color: black/red/blue/purple Model A: XT metal brake pads Model B: Cooling brake pads Piston diameter: 14mm CALIPER: One piece forging aluminum body Both 51 mm IS 74mm post mounting ROTOR: Caliper compatible 140/160/180/203mm rotor Calipers original fit for 160mm rotor, if you want use for 180mm or 203mm rotor, need use brake adapter(not include) Four-piston, double-standard brake Compared with the double-piston brake of the same level, the braking force is increased by 20%, and the wear resistance is increased by 150%. The dual-brake four-piston piston transmits the oil pressure directly to the brake pads to keep the brakes stable and make the brake transmission more efficient Cooling brake pads Meterial: SZ-001: resin TC-001: ceramic TJ-001: copper base Size: 39mm*36.5mm 6 Colors Front left brake caliper The tubing length is about 800mm Weight: about 264g Rear right brake caliper The tubing length is about 1450mm Weight: about 279g