Shimano Dura Ace HP-7410 Threadless-type (sometimes called Aheadset or NoThreadSet) headset.For 1 inch threadless forks. Featuring lightweight (91 grams!) aluminum construction, with wonderfully smooth cartridge sealed-bearings. Classic styling with modern functionality. Suitable for frames with head tube internal diameter of 30.2mm, and fork bearing race section external diameter of 26.4mm. This is a rare headset and is custom configured to be threadless type; cups and race are all very lightweight, machined and finished in Osaka, Japan. The HP-7410 is a race-quality headset, made in Japan with highly weather-resistant sealed bearings.
We also do have the standard threaded version Italian and JIS-type Dura Ace HP-7410 headsets available.