What I am about to share with you is basic knowledge about spokes/nipples.

How to choose spokes

The component that connects the hub to the nipple. It affects the aerodynamic drag and the strength of the entire wheel against torsion.

Plain spoke

Spoke with a circular cross-sectional view, the most common shape.

Size

#14: The most common spoke thickness for sports cars with an outer diameter of 2.0 mm. Used on various types of bikes from road to cargo bikes.

#15: Spokes with an outer diameter of 1.8 mm. The thinner and lighter spokes emphasize the weak point of the spoke, called the neck, so they are not suitable for hard use.
It is used for bicycles that require lightness.

#14-15-14: Double-butted spokes. The tip and back end are thicker and the center is thinner. This spoke is used to add strength to the weak point of a thin spoke while also making it lighter in weight.
#13-14: The weak point of the spoke, known as the neck, is thicker to provide strength and durability.

Aero Spoke

The spoke cross section is like a plate, and the area of the spoke in the direction of rotation is smaller, which is expected to reduce aerodynamic drag. However, in the lateral direction, it is affected by crosswinds due to its plate-like shape.
The force against torsion is also weaker than that of plain spokes.

How to Select Nipples

Nipple is a part that connects spokes and rim.

Material

Brass: heavier but stronger nipple with longer life.
Aluminum: Lighter in weight, but wears out more quickly than Brass and needs to be replaced every few years.

Size

The size of the spoke should be determined according to the size of the spoke.