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  1. #1
    Senior Member PatrickGSR94's Avatar
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    Wife's BD bike - major diet for little cash!

    I finally ordered a new Shimano M131 crankset and BB-UN55 bottom bracket to replace the wobbling junk that came stock on my wife's BikesDirect bike. The chain rings were wobbling such that the chain would move back and forth and rub one or sometimes even both FD plates.

    Took everything off, and HOLY CRAP the old forged steel crank arms were beastly! The old crankset weighed in at 1,680 grams! The new Shimano crankset with aluminum crank arms and similar riveted steel chain rings came in at just 1,073 grams! That's a difference of 607g or 1.34 pounds for a mere $25!

    The Shimano BB ended up being 310g vs. the original's 307, but it has a metal left side adapter cup vs. the original one being plastic. Also the original is a "Chia Haur" BB which I read has had a history of issues including catastrophic failure. So I'm glad I got that thing out of there.

    "Before" pic:








    2011 Felt Z85 105 | Ultegra | KMC | Selle Italia | Vuelta | Topeak
    90's-ish KHS Alite 1000 MTB, *hybridized*

  2. #2
    Senior Member
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    Aug 2012
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    No better feeling than doing the job yourself!

  3. #3
    Bicycle Repair Man !!! Sixty Fiver's Avatar
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    I call this working for smoochies... my wife actually has pretty decent mechanical skills but loves when she does not have to worry about these things.

  4. #4
    Senior Member PatrickGSR94's Avatar
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    lol my wife probably wouldn't care either way... but I saw the original crank wobbling and it bugged me probably way more than her. I just wanted an excuse to work on something, plus helped me learn how bottom brackets go together.
    2011 Felt Z85 105 | Ultegra | KMC | Selle Italia | Vuelta | Topeak
    90's-ish KHS Alite 1000 MTB, *hybridized*

  5. #5
    coprolite fietsbob's Avatar
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    Now you know how they can sell them for Less.. Fit cheaper parts./buy thousands at a time.
    Last edited by fietsbob; 11-07-13 at 12:46 PM.

  6. #6
    aka Phil Jungels Wanderer's Avatar
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    Apr 2005
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    Where did you get a Shimano bottom bracket, rings, and arms, for $25?

    "Retirement is the best job I ever had!" Me, 2009


    Specialized Crosstrail Sport - '08
    Nishiki Sport - misappropriated from my youngest son (circa 1984)
    Marin Stinson - misappropriated by my youngest grandson - '01
    "The Beast" - 1990 Schwinn Airdyne (in the basement for winter torture)

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