The brake—both front and rear are mechanically identical—has a narrow shape and it mounts to the frame without any pieces extending away from the frame. A standard external caliper is certainly easier to adjust, but Felt’s aero version seems to have eliminated some shortcomings of other integrated aero brakes. It is quite similar to the brake on the Trek Speed Concept 9 Series, but with a few refinements that make it easier to adjust.
Felt’s brake is fairly easy to work on despite being fully integrated into the frame. It can be tuned to fit narrow rims or broad aero wheels without moving spacers or filing brake pads. A cover attached by two screws shields the brake. Remove it and the cable is exposed. A piece that attaches to the cable slides on a track that keeps it fixed in place, allowing the cable to be easily pinched using a single Allen wrench instead of requiring another wrench to hold the pinch piece. The pads can be toed in any direction and adjusted horizontally.
Either mechanical or electronic drivetrains can be set on the same frame.
Felt designed a unique seatpost retention system that eliminates the risk of crushing the seatpost. As an added benefit, a cosmetic piece of the system marks saddle height when the post is removed.