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  1. #1
    Junior Member
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    Changing type of bottom bracket/crankset

    Hi all,
    Due to having a few problems with my left crank arm coming loose all the time (Truvativ Isoflow, square taper) I'm considering changing the whole set up.
    I've been looking at hollowtec type cranks, and the compatable BB's, but my bike currently has the non-external bearings set up.

    I have a 68mm frame.
    Can I change the set up, and if so, do I only need the crankset and BB?

    Thanks

  2. #2
    Senior Member
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    yes you only need a new crank and bb

  3. #3
    Junior Member
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    Nice one my friend, thank you.

  4. #4
    cab horn
    Join Date
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    Quote Originally Posted by nellyeff View Post
    Nice one my friend, thank you.
    And you might need the fame faced as well.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  5. #5
    Low car diet JiveTurkey's Avatar
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    Also, cranks don't just come loose all the time. It was likely not tightened down enough once, and the hard steel BB spindle started rounding out the square aluminum hole in the crank, then it couldn't ever get tight enough.

    Tighten everything to spec. on your new setup to prevent it from happening again.
    Quote Originally Posted by slopvehicle View Post
    Not wearing a helmet makes me more aware of my surroundings. I find myself anticipating the hardness of concrete 50 or 100 feet in front of me, it's almost a zen-like connection between my face and the pavement.

  6. #6
    Junior Member
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    Jive, I'm on my second crank arm, which has been anally treated to the most scrupulous fitting session, cleaning, torqued, threadlocked etc etc.... after it was replaced under warranty.
    Its happened again, so I'm changing the whole set up.

  7. #7
    Bikezilla
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    I too am replacing my BB and Crankset. I scored a nice Ultegra SL crankset (FC-6601) and matching BB. What I am now trying to figure out is how much of my remaining drivetrain needs replacement. I have an older Shimano 600 7-speed rear cassette and Shimano 600 derailleurs that work just fine. Any advice?

  8. #8
    cab horn
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    Quote Originally Posted by liveoakie View Post
    I too am replacing my BB and Crankset. I scored a nice Ultegra SL crankset (FC-6601) and matching BB. What I am now trying to figure out is how much of my remaining drivetrain needs replacement. I have an older Shimano 600 7-speed rear cassette and Shimano 600 derailleurs that work just fine. Any advice?
    Maybe provide less information on what your plan on doing.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  9. #9
    Bikezilla
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    Confused

    Quote Originally Posted by operator View Post
    Maybe provide less information on what your plan on doing.
    Hmm, well if your suggestion is to provide LESS information on what I am doing, how is that really going to help me? I thought the point of these forums was to HELP and BE HELPED. Usually, it is my experience that too little, not too much information is the problem. Please explain, as this is my very first post to this forum and I am perplexed as to what I should do.

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