The short 2 mm section of the d-Light reduces weight especially on the threaded side. The 2 mm section starts just at the beginning of the thread. Therefore, the rotating masses at the end of the spoke are especially reduced. This brings benefits to both the acceleration and braking qualities of the wheel.
The middle section is increased to 1,65 mm, which makes the spoke much stiffer and brings less torsion during truing than a 1,5 mm middle section. This results in an easier building process of the wheels.