Spokes

The thickness of a spoke is usually 13G or 14G. G is the abbreviation for an English wire size where a lower number corresponds to a larger thickness. 13G is used in rear wheels for city bikes and is about 2.3 mm. 14G is used in most other wheels and is about 2.0 mm. 12G is used in transport bikes and is about 2.6 mm. The length of a spoke is measured from the inside of the head to the thread.