Freno a Disco Campagnolo H03 AFS Alu spider

The Campagnolo H11 AFS Disc Rotor comes in 2 sizes, notably 140 mm and 160 mm versions. The brake surface with both rotors is made using stainless steel mounted to an aluminium carrier. The 140 mm rotor is fixed to the carrier at 6 points while the 160 mm version uses 7. The rotors offer a balance between heat dissipation and weight. This provides you with consistent stopping power, aiding your safety on the bike. The rounded edges of the rotor further help to that end.

- Campagnolo H03 AFS Alu spider brake disc rotor

How do I mount a disc brake rotor?
For disc brake rotors, you have 2 different ways of mounting depending on the lock ring. One has an internal fit that you can tighten with a Cassette Removal Tool without a pin. If the inside of the key is open, it can reach far enough over the axle of the wheel. The other version is an external fit that you can tighten with a bottom bracket tool.