The new pro3 hub replaces the mono hubs with the proven range of pro2s having gone from strength to strength since they were launched the pro3 is the development of that hub and is specifically aimed at road and non disc users this hub features a one piece 7075 aluminium rotor body and pawl carrier four pawls engage into a twenty four steel ratchet which is fixed onto the hub shell and is sealed with a frictionless non contact labyrinth seal the hub uses custom stainless cartridge bearing