AER Series II

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Long recognized as the world’s lightest headset, the new AER now offers a hybrid steel and aluminum bearing that provides even greater durability and a 40% weight savings over comparable models. Strategic machining and precision contours provide an optimal balance between weight savings and strength. The new AER headset is now an ideal headset choice for road and mountain bike applications- a high quality durable headset with durability and lightweight performance in mind. For an ultralight “Race Day” application, road riders can outfit their AER with a Norglide composite bearing.


The AER-Series hybrid Steel/Aluminum maintains the quality and durability our bearings are known for, while shaving 35% of the weight.



Cups and Covers
7075 T-6 Aluminum, contoured and relieved to minimize weight and maximize strength
Compression Ring
Cup-in compression ring
Crown Race
Aluminum crown race with integrated low-friction seal
Lightweight aluminum/ steel hybrid bearing
  • ZS44 will take a 41mm bearing
  • EC44/40 will take a 52mm bearing
  • EC44/33 will take a 47mm bearing
  • ZS56 will take a 52mm bearing
  • IS41 will take a 41mm bearing
  • IS42 will take a 42mm bearing
  • IS47/33 will take a 47mm bearing
  • IS52 will take a 52mm bearing
All complete Cane Creek AER series headset assemblies (top or bottom) will use a 36x45 degree contact angle bearing, with the exception of our IS47/33 and EC44/33 headset assemblies. IS47/33 and EC44/33 will use a 45x45 degree contact angle bearing.
"Race Day" Top Bearing
PTFE composite bearing (Road Only / Sold Seperately)
Interlok® spacer compatible
Stack Heights
  ZeroStack (ZS) — 8mm or 15mm top, 4mm bottom Integrated (IS) — 9mm or 15mm top, 1mm bottom  


Technical Documents

Got more questions? Check the Headset FAQ here.