Trp spyke mechanical 2 piston disc brakethe spyke is a mechanical disc brake for mountain bikes that offers superior performance and is simple to set up it is a dual sided mechanical caliper where both pads actuate providing even and precise clamping force this results in even pad wear and easy adjustment with the addition of a barrel adjuster no longer is adjusting the whole caliper necessary as the pads wear all of this in a 169g per caliper package that works with all linear pull levers