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  1. #1
    Trek advocate
    Join Date
    Jul 2007
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    Trek 4500, Trek 2300
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    bottom bracket / crankset help

    Hi all,

    I'm looking for a Shimano BB-UN72 73mm x 110mm bottom bracket. Nobody seems to sell one for my Trek 4500. I replaced it 4 years ago or so and it's toast again. I also replaced the crankset with a Deore. If I can't find the BB can I replace both with a Shimano LX FC-M580 crankset. Will this work with my existing FD and chain?

    Thanks all.

  2. #2
    Senior Member
    Join Date
    Aug 2005
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    Pittsburgh, PA
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    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
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    You are in luck. Nashbar has the UN73 bb in 73x110 in stock and it's only $18. Look here:

    http://www.nashbar.com/profile.cfm?c...tom%20Brackets

    Even cheaper, they have the UN25 in 73x110 for only $6! Again, look here:

    http://www.nashbar.com/profile.cfm?c...tom%20Brackets

  3. #3
    Trek advocate
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    Jul 2007
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    Quote Originally Posted by HillRider View Post
    You are in luck. Nashbar has the UN73 bb in 73x110 in stock and it's only $18. Look here:

    http://www.nashbar.com/profile.cfm?c...tom%20Brackets

    Even cheaper, they have the UN25 in 73x110 for only $6! Again, look here:

    http://www.nashbar.com/profile.cfm?c...tom%20Brackets
    Is the UN73 the same as the UN72? Will it fit?

    Thanks.

  4. #4
    In beaurocratic limbo urbanknight's Avatar
    Join Date
    Mar 2006
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    Los Angeles, CA
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    Specialized Allez, K2 Razorback
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    Just a newer model if I recall. It will fit.
    "Well, I guess you can cut the arts as much as you want... Sooner or later, these kids aren't going to have anything to read or write about." (Richard Dreyfus as Glenn Holland)

  5. #5
    Trek advocate
    Join Date
    Jul 2007
    Location
    NJ
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    Trek 4500, Trek 2300
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    Thanks a lot. It's on order!

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