React-4: Redefining Braking for the MTB Rider. At the heart of this innovative 4 piston brake system lies a formidable 4-piston hydraulic calliper, meticulously engineered to provide unmatched stopping power and precision control. Whether navigating steep descents or tackling challenging trails, React 4 ensures powerful, reliable performance in even the most demanding conditions Features: Powerful 4 Piston hydraulic brake system Smooth, powerful modulated braking Self adjusting 16mm calliper pistons Split-C lever bracket design Lever reach adjustment to suit all hand sizes Suitable for MTB and Hybrid bikes Uses environmentally friendly mineral oil International standard and post mount compatible Complete brake set Stainless steel rotors Spare olives to allow for hose reduction Weight - 315g Complies with and exceeds EN15194 and ISO4210 regulations 160mm Front and 160mm rear rotors This set comes with the hoses connected, filled with mineral fluid and pre-bled. All ready to fit straight onto your bike. It also includes all the bolts and fittings you will need, as well as 2 spare olives should you wish to reduce or replace the hoses. Front hose length is 800mm and Rear hose length is 1800mm.This is a UK specification set, front brake/right hand lever, rear brake/left hand lever. We deliver all our brake sets as standard, using 3/4 day tracked delivery service. Replacement rotor (CL027-160 / 180)Replacement disc pads (VX/VRX851)