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  1. #1
    Flat Ire
    Join Date
    Feb 2008
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    SoCal
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    Trek 1100, DeRosa Idol
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    Crankset and bearings thrashed

    Bad news for me, the bearings in my bottom bracket went bad and scored the shaft of the crankset, so it looks like I'm in for some expensive repair, unless the bike shop that I got it from will cover it under warranty. I haven't approached them yet.

    The equipment specifics are Dura-Ace 7803 crankset and Boca Dura Ace full ceramic bearings.

    I got this bike in April '08 and in that 30 weeks have ridden almost every weekend, on the average 100 miles with 4,000 feet of ascent. This problem became evident on my last ride, in which I encountered rain, so I suspect dirt got splashed up onto the crankset and somehow found its way into the bearings.

    Am I right in thinking that even with that considerable usage, that this premature wear? Would improper installation by the bike shop be a likely cause?

    I haven't done any maintenance on the bearings in that time, like taking them out and cleaning & lubing them. Was that a mistake?

    Ceramic bearings are nice for reducing friction, but are they a lot less durable than steel?

  2. #2
    cab horn
    Join Date
    Jun 2004
    Location
    Toronto
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    1987 Bianchi Campione
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    The problem is the ceramic bearings. They ARE less durable. For meaningless performance increase on non-world record setting events.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  3. #3
    Rat Bastard mcoomer's Avatar
    Join Date
    Jul 2006
    Location
    Sammamish, WA
    My Bikes
    Cannondale Prophet, Specialized S-Works SL2, Specialized S-Works Stumpjumper
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    If the bike is April '08 new and we're talking about original equipment purchased from and assembled by a shop you should be covered under warranty. Also, if you are having a bearing failure I doubt it was due to one ride in the rain. More likely that something else is at play here.

    As for durability, I can only go by what I hear and I think that it's universally accepted that ceramic bearings have are harder and have a longer service life than steel. Obviously, a bad set of bearings is a bad set whether they're steel or ceramic.

    Take your problems to the shop and ask for warranty repair.

    Mike
    It's better to burn out than fade away...or slip out of your pedal and face plant on the side of the road!!!

    '06 Cannondale Prophet
    '08 Specialized S-Works Stumpjumper
    '09 Specialized S-Works Tarmac SL2

  4. #4
    Flat Ire
    Join Date
    Feb 2008
    Location
    SoCal
    My Bikes
    Trek 1100, DeRosa Idol
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    thanks..

    Thanks for the info peoples. I'm working with the bike shop and it looks like this will be covered under warranty.
    During the downtime I will be indulging in nostalgia, riding on my vintage Trek 1100 -- with steel bearings.

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