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Old 10-15-10, 11:56 AM   #1
trek330
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dura ace headset

Would a Dura Ace 7700 headset be replaceable with a Dura Ace HP 7410 series?They both are 1 inch and the 7410 is 24TPI(whatever that means)Thanks!I need a new headset!
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Old 10-15-10, 12:31 PM   #2
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yes you can change one for the other . TPI means thread per inch. the 1 inch mean the size of the steering tube on the fork.
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Old 10-15-10, 12:36 PM   #3
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stack height compatible?
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Old 10-15-10, 02:06 PM   #4
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How do I determine stack height?
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Old 10-15-10, 02:43 PM   #5
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take the headset off the bike , stack the parts on a table in the same order, use capliers or a ruler and measure. if the new one is the same or smaller (shorter) then all is good. if not you need a longer steeing tube on the fork . or new fork.
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Old 10-15-10, 04:26 PM   #6
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Quote:
Originally Posted by bikeman715 View Post
take the headset off the bike , stack the parts on a table in the same order, use capliers or a ruler and measure. if the new one is the same or smaller (shorter) then all is good. if not you need a longer steeing tube on the fork . or new fork.
This assumes the portion of each cup that is pressed into the headtube is the same height, right? I would have expected some variance between different headset models.
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Old 10-15-10, 05:46 PM   #7
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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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Old 10-15-10, 08:19 PM   #8
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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.
Maybe that's why I don't find a 7700 headset on e-bay!!
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