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  1. #1
    Senior Member kleng's Avatar
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    Dura-ace front hub - missing bearing

    Hi

    I was just servicing the front hub of my dura-ace 7801 wheelset and noticed that there are 16 loose bearings on each side with a gap. This means there is room for one more bearing on each side.

    Can I just add another bearing or does the design only call for 16 bearings leaving this gap.

  2. #2
    jcm
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    I may be mistaken, but I think there is supposed to be a gap for movement.

  3. #3
    JBD
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    French Warmonger JBD's Avatar
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    I believe you have just found the "n-1" rule of bearings. (n-2 for headsets I believe)
    that is to say as many bearings as will fit or start to jumble and remove one. a search will probably tell you more, but for your purposes, the hub likely has the right number of bearings.
    I didn't forget to not add a sig. Here it is:http://www.milkyfan.com/images/adopt/coffeeandmilky.gif

  4. #4
    Elitist Troglodyte DMF's Avatar
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    WH-7801 callout is for a retainer with 5/32" balls. I take it someone replaced it?

    (Yes, use the n-1 rule if no retainer.)
    Stupidity got us into this mess - why can't it get us out?

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  5. #5
    Your mom
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    There definitely should be extra room in there, just not a lot. 16 seems like a weird number to me, though. I thought bearing numbers went in 9s, 10s, or 11s?

  6. #6
    Elitist Troglodyte DMF's Avatar
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    HB-7800 hub takes 14 per side (loose). One I know takes 18. Kinda depends on ball size.
    Stupidity got us into this mess - why can't it get us out?

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  7. #7
    Senior Member Bill Kapaun's Avatar
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    " Can I just add another bearing....."
    You don't want to add 1 even if it needs it. Replace all of them from the same lot, so they match up.
    IF 1 is a slightly different size, bad (grindy) things can happen.

  8. #8
    Elitist Troglodyte DMF's Avatar
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    +!
    Stupidity got us into this mess - why can't it get us out?

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