Hub race condition...time for new hubs?
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  1. #1
    RoadBikeReview Member
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    Hub race condition...time for new hubs?

    Hi All: I have a pair of 10-yr-old Deore XT M510 hubs with about 25K miles on them. I rebuilt them twice, the last time a few years ago. I was going to build up a new set of wheels with them but after cleaning I see that the non-drive-side cones of both the front and rear are badly pitted, and the races on that side feel smooth but are not bright and shiny. See comparison pics below of the front hub (the rear looks similar...maybe worse).

    This is the drive side with a nice, shiny race:

    deorefrontR.jpg

    And this is the non-drive-side:

    deorefrontL.jpg

    I already bought a couple of replacement non-drive-side cones before I did a fully teardown, but should I bother? Are the hubs toast at this point?

  2. #2
    'brifter' is a lame word.
    Reputation: cxwrench's Avatar
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    If you don't see/feel wear on the cups then rebuild them and ride 'em.
    I work for some bike racers
    I've got some bikes, some guns,
    and a bunch of skateboards

  3. #3
    RoadBikeReview Member
    Reputation: Fredrico's Avatar
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    Quote Originally Posted by nycyclist06 View Post
    Hi All: I have a pair of 10-yr-old Deore XT M510 hubs with about 25K miles on them. I rebuilt them twice, the last time a few years ago. I was going to build up a new set of wheels with them but after cleaning I see that the non-drive-side cones of both the front and rear are badly pitted, and the races on that side feel smooth but are not bright and shiny. See comparison pics below of the front hub (the rear looks similar...maybe worse).

    This is the drive side with a nice, shiny race:

    deorefrontR.jpg

    And this is the non-drive-side:

    deorefrontL.jpg

    I already bought a couple of replacement non-drive-side cones before I did a fully teardown, but should I bother? Are the hubs toast at this point?
    The non drive side race looks like its starting to give up. Looks like the inscrutable minds at Shimano decided the non drive side race doesn't have to be as stout as the drive side which looks fine.

    I think you'll have to replace the pitted races. Or ride it until a ball splits and the hub loosens up.

  4. #4
    Russian Troll Farmer
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    Well, they're far from pristine, but I've used worse. Instead of using Phil's grease, I would probably lubricate them with automotive MolySlip, available at any auto parts store. The molybdenum supposedly fills in smaller pits.
    "L'enfer, c'est les autres"

  5. #5
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    Thanks Everyone! I'll rebuild them and hope for the best

  6. #6
    RoadBikeReview Member
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    Quote Originally Posted by nycyclist06 View Post
    Thanks Everyone! I'll rebuild them and hope for the best
    It's essentially a zero cost option, except for the value of your time. I agree that if the race is not pitted or grooved, then ride on.

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