Shimano dura ace 7900 r55c3 brake pads shimanos dura ace 7900 r55c3 brake pads have a compound that is specifically designed for carbon fibre rims which have a carbon braking surface they are compatible with all shimano road bike calipers and offer high braking performance without causing damage to your carbon rims genuine shimano replacement parts compatible with 7900 7800 7700 6700 6600 6500 5700 5600 and 5500 brakespad compound formulated for use with carbon rim braking surface a 2