The traditional AER headset is milled to save weight and uses the Norglide X2 bearing that weighs just 1.5g
Good quality one-inch components are getting scarcer but if Woodman’s Jupiter Aheadset is anything to go by, they're not about to disappear just yet. Weighing 156g, the Jupiter will suit anyone needing a bombproof headset and I can understand its popularity amongst the single speed fraternity. The unique, inverted crown race shields super smooth needle roller bearings from dirt and road srpay while O-ring seals complete the belt and braces weather protection.
One inch threaded headsets are increasingly close to extinction on new bikes but this one might come to the rescue of older mid range winter trainers, crossers and commu-tourers needing a cheap but fairly cheerful replacement.
The nine-piece alloy construction keeps the weight low and styling is reminiscent of Stronglight’s venerable A9 unit but the Acor requires careful installation to avoid damage, especially to the crown race. A moderate 37.5mm stack height means it should fit all but the most shallow of steerers.