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  1. #1
    Commuting Fool
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    What type of crank bolt do Bulletproof track cranks use?

    I just ordered these.

    Square taper, but doesn't come with crank bolts.

    Do all LBS's have crank bolts to fit these? Are there different sizes? Help appreciated
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    When you lose yours, it's a depression" - Harry S Truman

  2. #2
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    Any bike shop should have what you need. Just make sure to get "BMX" or "Track" chainring bolts (they are shorter).

  3. #3
    Senior Member DannoXYZ's Avatar
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    Those cranks look used, are the flats on the square-taper clean and pristine?

    Be sure to get a torque-wrench and tighten the crankarm bolts to 30-35 lb*ft. You have pretty much just one chance to install them correctly. If the bolts aren't tight enough, the cranks will wobble loose and the bottom-bracket spindle will gouge out the square-taper. The cranks will never ever fit correctly again after that and will come lose no matter how tight you crank down on the crankarm bolts.

  4. #4
    Your mom
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    That's a pretty dire prediction. I've installed many cranks and never had one strip. And I've never used a torque wrench. Just put everything on tight. Then ride. And don't worry about it; it's not as if Bulletproof cranks cost much any way.

    Oh, and you need short stack bolts, or track / BMX ones. Alternatively, you can just grind the female part of a normal length set down.

  5. #5
    Commuting Fool
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    Quote Originally Posted by tellyho View Post
    That's a pretty dire prediction. I've installed many cranks and never had one strip. And I've never used a torque wrench. Just put everything on tight. Then ride. And don't worry about it; it's not as if Bulletproof cranks cost much any way.

    Oh, and you need short stack bolts, or track / BMX ones. Alternatively, you can just grind the female part of a normal length set down.
    and you need short stack bolts
    These are the same as chainring bolts?
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  6. #6
    Senior Member DannoXYZ's Avatar
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    Quote Originally Posted by tellyho View Post
    That's a pretty dire prediction. I've installed many cranks and never had one strip. And I've never used a torque wrench. Just put everything on tight. Then ride. And don't worry about it; it's not as if Bulletproof cranks cost much any way.
    Well, there's enough people that have them come loose that you need to convert "tight" into measurable numbers:

    Crankarm bolt keeps coming loose
    Loose crank shaft, second time
    crankarm coming loose
    Non-drive-side crank coming loose... repeatedly
    rounded out iro crank = wobbly
    Out of commission for nearly another week....
    Loosening Crank arm
    Crank Torque (and other questions)
    Left Crank Falling Off
    My crank arm fell off while riding
    Crank coming loose
    Crank Arm Fell off...
    Crank arm
    Loose crank shaft, second time
    Re-torquing a crank arm bolt
    Crank arm
    Crank arm continually comes loose

    I've never been in a car-wreck, but that doesn't mean I don't wear my seatbelts or have insurance.

  7. #7
    Senior Member TimJ's Avatar
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    Quote Originally Posted by Autobus View Post
    These are the same as chainring bolts?

    Crank bolts are what hold the crank onto the bb. For square taper and a modern bb they're all the same.

    Chainring bolts hold the chainring onto the crank. For 1 chainring you need singlespeed chainring bolts. That guy who responded didn't read carefully and thought you were talking about chainring bolts, not crank bolts.
    fun facts: Psychopaths have trouble understanding abstract concepts.
    "Incompetent individuals, compared with their more competent peers, will dramatically overestimate their ability and performance relative to objective criteria."

  8. #8
    Your mom
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    Doh, you're right. My fault.

    Any crank bolt will do. The LBS shouldn't charge you for those, unless they're hurting.

    I would argue that anyone that has their crankarm coming loose has issues other than not owning a torque wrench.

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