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  1. #1
    Spice
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    Dec 2008
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    685

    Caution;  Merge;  Workers Ahead! Metal Shielded Bearings

    I'm about to get a few new bearings (jockey wheel and bottom bracket) and came across metal sealed bearings (the plastic/rubber shield found on usual sealed bearings is replaced by a metal part, they have a ZZ code)
    My question to (those of you who know what you're talking about and arnt guessing ) is are these bearings better sealed against water and dirt penetration, or is it best to stick with rubber sealed bearings?
    link:
    http://www.bearings.uk.com/acatalog/6801_Bearing.html

    Are contact seals better at keeping water out than non contact seals?

    Cheers

    Joe

  2. #2
    mtbr member
    Reputation: EBasil's Avatar
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    Jan 2004
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    2,108
    Metal shields don't seal as well as the rubber-coated (note not only rubber) contact shields do. Some metal shields are crimped into place and you really, really don't want those since you can't "maintenance" the bearings without destroying the shield.

    The contact shields seal better than non-contact and are what you want, "in rubber".

  3. #3
    mtbr member
    Reputation: IRONMAN1518's Avatar
    Join Date
    Jul 2008
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    736
    I agree with Ebasil!! Rubber seal "seals" far better and super easy to pry up with a needle to add grease to it. Good luck!
    Training on Hills Builds Character, That's How I Got To Be One!

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