» A bike exerts 2 kinds of forces:
"Angular Contact Force" (ACF) and "Pressing Force" (PF). Efficient handling of these 2 forces are crucial to your headset's longevity and proper functioning.
BBB headsets use:
1. Angular Contact Bearings - Especially made to deal with ACF.
2. 36 / 45 degree chamfers - Designed and proven to be the optimum angles depending on application, at handling PF.