Patent ID: 7416060

Claim:
A bicycle disc brake rotor assembly for a bicycle disc brake device, the bicycle disc brake rotor assembly comprising: a rotor member including a first ring-shaped member and a pair of second ring-shaped members disposed on opposite sides of the first ring-shaped member, the second ring shaped members including a material with higher wear resistance than the first ring-shaped member, the second ring shaped members defining brake pad engaging friction surfaces of the rotor member on exposed sides thereof, the first ring-shaped member having a first thickness measured in an axial direction relative to the rotor member in the region adjacent to the brake pad engaging friction surfaces and the pair of second ring-shaped members each having a second thickness measured in the axial direction in the region of the brake pad engaging friction surfaces, at least one fixing hole being formed through the first ring-shaped member and the second ring-shaped members with at least one depression formed in the surface of the rotor member such that the first ring-shaped member has a reduced thickness less than the first thickness in an area corresponding to the depression around the fixing hole and each of the second ring-shaped members has a thickness in the area corresponding to the depression around the fixing hole that is approximately the same as the second thickness; a rotor mounting component that is integrally formed with a hub, the rotor mounting component having at least one fixing hole aligned with the at least one fixing hole of the rotor member; and at least one fastening member mounted through the at least one fixing hole of the first ring-shaped member and the second ring shaped members of the rotor member and the at least one fixing hole of the rotor mounting member to fixedly attach the rotor member to the rotor mounting component.