On February 6, 2014 I started a bicycle wheel building class that met once a week for 4 weeks. I purchased a H Plus Son TB14 rim because of its double eyelets and classic box section design that is reminiscent of the Ambrosio Nemesis.

Spoke length

Using an analog and then digital caliper, OLD ≈ 120.5mm. I then measured the flange width to be  ≈ 3.35mm and the distance between the outside of the lock nut and the outside of the flange, x ≈ 27.5mm.

$$W_{L}=\frac{120.5mm}{2}-27.5mm+\frac{3.35mm}{2}$$

WL = 60.25mm − 27.5mm + 1.675mm = 34.425mm

Therefore the distance from the center of the flange to the center of the hub is 34.425mm.

In this example each spoke will cross three times so C = 3. While the total number of spokes, N = 28.

$$\angle BAC=\frac{2\pi}{\frac{28}{2}}\times 3=\frac{3\pi}{7}$$

I calculated the spoke length to be approximately 300mm.