Avid is a sunsidiary of SRAM and was started in 1991 with the concept 'Small Details. Big Difference'. Avid works hard to bring the most dramatic improvements and make products so good you find it hard to ride without it. The Avid Disc Brake Rotor G2 Cleansweep is a Rotor dor Disc Brakes, the design of the G2 design helps keep the dirt and grime from mucking up your ride. THese rotors can be used with Elixir 1 and Ball Bearing Disc Brakes.