A-Headset IS Integrated Headset (36 x 45 Degree Bearings)
Works with older frames such as Volume Ardelean and some other models, will not fit most modern integrated (45 x 45 Degree) BMX Frames.
The Aheadset IS features an integrated race/compression ring with a simple O-ring to seal out contaminants and increase the headset's life expectancy.
EC, EC-Threaded, IS and ZS headsets are individual models in the Aheadset systemsystem
Compression ring is integrated into the top cover creating one simple, light part
IS features Cane Creek semi-cartridge lower bearing and caged Aheadset system upper bearing