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  1. #1
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    how does the new un54 bb compare to the old un73 bb?

    it looks like i'm going to have to get a un 54 bb as my new cranks don't work with my old bb suprisingly enough.

    what should i expect as far as quality and weight?

    is there any place that still has the old un73?

  2. #2
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    You'll get huge weight saving because UN54 is plastic.
    But overall it's a good bb.

    www.biketoolsetc.com has high quality Tange bottom brackets:



    The Tange LN79 Series bottom brackets feature an aluminum alloy body & cups, and a forged steel spindle with standard 8mm crank bolt threads. High quality and lightweight at an affordable price. 220 grams! Made in Japan.
    Last edited by Barabaika; 06-14-08 at 09:50 PM.

  3. #3
    Senior Member bellweatherman's Avatar
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    I thought that they were both metal, with a plastic fixed cup that threads into the non-drive side.
    Livestrong. The personal fundmaker of Lance Armstrong. The company who are in business to not donate to cancer research, but only to inform people that cancer is bad.

    Armstrong. The man without integrity, no care for the sport, and no problem with testing positive for EPO and making donations to cover it up.

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  4. #4
    Perineal Pressurized dobber's Avatar
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    Quote Originally Posted by Barabaika View Post
    You'll get huge weight saving because UN54 is plastic.
    But overall it's a good bb.

    www.biketoolsetc.com has high quality Tange bottom brackets:


    The UN54 is still metal, the only plastic (phenolic) parts is the non-drive side cup. The 54 combines the weight reduction of the 73 (hollow spindle) with the pricepoint of the 53. Basically Shimano combined the two lines into one.

    Why do you say your crank doesn't work with the old bb?
    This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.

  5. #5
    cab horn
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    Quote Originally Posted by Barabaika View Post
    www.biketoolsetc.com has high quality Tange bottom brackets:

    Tange makes high quality bb's?
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  6. #6
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    it's not the right spindle lenght. the old cranks were the m480 and the new are the m460. i couldn't even shift into the small ring. :/

  7. #7
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    Quote Originally Posted by operator View Post
    Tange makes high quality bb's?
    I heard that Tange made bbs for Shimano.
    What's so special about bb? When it starts to creak, you just put a new one. They are cheap.

    Yes, there is always something that has higher quality.
    But in the bike industry it means exotic materials and lighter weight.

    What about this bb for $90?

    FSA Cartridge Bottom Bracket

    The Ultimax Carbon/Titanium Cartridge Bottom Bracket features a carbon fiber body, cold forged aluminum cups, and a hollow titanium spindle with standard 8mm crank bolt thread. 68mm (English) shell width, 110.5mm spindle length, 170 grams. Made in Taiwan.
    Last edited by Barabaika; 06-14-08 at 12:46 PM.

  8. #8
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    Hawley catalotg is showing that the UN54 is over 300 grams...seems kind of heavy to have a hollow spindle...

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