Trp spyre slc mechanical 2 piston disc brake the trp spyre slc disc brake has a carbon actuation arm for maximum weight savings it is a dual sided mechanical brake where both pads actuate providing an even and precise clamping force this translates into even pad wear and with the addition of a simple cable barrel adjuster the pads can be adjusted easily and hassle free works with all cable actuated road levers 140mm or 160mm rotor options will work for both front and rear