The round shape of the head of the polyax nipples works like a ball-joint between the rim and the nipple ensuring a better spoke/nipple line. Polyax nipples are offerred in 12, 14, and 16 mm.
Inverted nipples are used in special rims. Because the whole nipple remains in the rim, it gives a better aerodynamic profile as well as a better design. Due to its special use, Sapim offers inverted nipples in 8,5, 10 and 12 mm.
Hexagonal head nipples allow to take higher torque without damaging the four spans of the nipple. Because truing is done from the head side that has a larger diameter, it can take more pressure. Hexagonal nipples are offered in 12 and 14mm.
Developed for special truing machines, the nipple is able to be trued
using either an internal or external spoke wrench. Nipples are
available in 16 and 18mm. (16mm similar to standard 12mm and 18mm
similar to standard 14mm)