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  1. #1
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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!

  2. #2
    Senior Member bikeman715's Avatar
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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.
    bikeman715

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    commuter TimeTravel_0's Avatar
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    stack height compatible?

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    How do I determine stack height?

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    Senior Member bikeman715's Avatar
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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.
    bikeman715

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    just pokin' along desertdork's Avatar
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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.

  7. #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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    Quote Originally Posted by HillRider View Post
    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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