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  1. #1
    Candlestick Maker
    Reputation: baker's Avatar
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    Help w/ 3-pc crank installation?

    I just picked up a new set of 3 piece cranks for my singlespeed. Fly Bikes
    Fly Cranks. 36.7oz for the whole deal. A bit lighter than the
    Profile setup and definitely well-built.

    My crankset is missing installation directions. I think I can figure it out but...
    I've never installed 3 piece cranks and wonder if anyone out there has
    directions.

    Here is what I have:
    crank arms
    bottom bracket cups w/ pressed in bearings
    bb sleeve
    1 conical spacer
    4 normal spacers (3 diff sizes)
    Two crank arm bolts
    48 spline spindle
    Installation tool w/ bolt (?)
    chainwheel bolt
    chainwheel adapter

    I'm really wondering the following:
    How do I decide where the spacers reside? Conical vs. normal?
    Do I use the installation tool vs. the crankarm bolts for putting on the arms?
    Do I put grease or anti-seize on the splines?
    Do I center the spindle or offset it to the driveside?
    Torque specs?
    How the heck do I remove the arms once they are installed?

    Thanks,
    baker

  2. #2
    hot like a box of fire
    Reputation: a nice cake's Avatar
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    OK, let me try and answer some questions:

    Prep the BB and cups just like you would in a normal cartridge install. Pick the proper internal spacer for your BB width.
    Install the cups with the spacer inside. (don't worry about it moving around, you can readjust with your fingers, before you insert the spindle.
    Insert the spindle, and starting adding spacers. I doubt it matters which side you use for which, so long as you space the arms out enough for your crank and chainwheel to clear the stays on their respective sides. You can use some light oil for threading on the cranks (i use a ti spindle, so they provide some graphite-like ti specific lube.) They should slide on or off fairly easily. Remember to be careful about lining the cranks up perfectly, 48-teeth nakes it easy to be off a little. Make sure to center the spindle with respect to the crank penetration. It should be equal for both arms. Just use the bolts to clamp the whole system together. They needn't be torqued especially hard, but keep an eye on them, or use some loctite, they like to worked themselves out, especially on the first few rides. I know from experience!

    hope that helps.

  3. #3
    Candlestick Maker
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    Thanks for the pointers. I'll give it a shot tomorrow evening after my new chainwheel
    arrives.

    baker

  4. #4
    mtbr member
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    since i'm pretty sure most 3-piece cranks install the same way, here's a link to Profile's manual.

    http://www.profileracing.com/manuals/3piececrankset.pdf

  5. #5
    Candlestick Maker
    Reputation: baker's Avatar
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    Quote Originally Posted by the Inbred
    since i'm pretty sure most 3-piece cranks install the same way, here's a link to Profile's manual.

    http://www.profileracing.com/manuals/3piececrankset.pdf
    Thanks. That'll help. I wish my cranks had come with a similar manual. The spacer
    info would have been useful.

    baker

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