Thread: dura ace headset
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Old 10-15-10 | 05:46 PM
  #7  
HillRider
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From: Pittsburgh, PA

Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!

The HP-7410 is a 1" threaded headset with cartridge bearings and has a stack height of 37.6 mm.

I can't find any reference in Shimano's tech documents to an HP-7700 headset but they do show the 7410. Also, I don't recall Shimano making anything newer than the 7410 version and by the time the 7700-series (9-speed Dura Ace) came out, Shimano was pretty much out of the headset business.
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