What began as a project for lightweight road bikes is now making its way into the MTB world. Cane Creek's new Aer bearings can be used as a replacement within 40 Series headsets. The bearings weigh 60% less than their steel counterparts thanks to an alloy casing, thin steel race, and steel bearings. They're fully sealed and compatible with many headset assemblies.
EUROBIKE - 2017 Mountain Bike Components