Disc 225 135mm
The rear hub uses a patented six pawl cam, and 24 ratchet teeth for engagement with the pawls. To be exact, the six pawl cam actuated engagement system consists of six double-tipped pawls, which engage in unison with 12 of the 24 ratchet teeth on the cassette. Whoa!
The Disc 225 has been in their product line for many years, and weighs in at 225 grams (not verified). The hub has a 17mm axle, and a one piece forged 7075 aluminum cassette body. One new feature on the rear hub is steel inserts/attachments on the aluminum cassette body to prevent galling and tearing of the cassette body. Aluminum cassette bodies are lightweight, but are soft, so they are prone to damage from a cassette’s interaction during drivetrain use. Bill Shook came up with a brilliant idea to add a couple of steel inserts on the splines, so that the tougher steel can take the abuse, and you still get the lightweight of the mostly aluminum cassette body.
On the left is an aluminum cassette body and the gouging damage that occurs through normal usage, while on the right is the newer steel faced American Classic aluminum cassette body, notice the significantly less damage that has occurred:
The steel face design is very innovative, and will not only increase the longevity of the cassette body, but it will keep the tolerances tight with better drivetrain performance. The Disc 225 has been reliable (one minor tightening required), and stiff, although it would have been nice to have a bolt on 10mm instead of the wimpy QR’s. The hub was extremely quiet, and I hardly ever noticed that they were buzzing along while riding.