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Old 08-07-08, 10:47 PM   #1
Autobus
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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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Old 08-07-08, 11:08 PM   #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).
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Old 08-08-08, 02:09 AM   #3
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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.
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Old 08-08-08, 11:28 AM   #4
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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.
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Old 08-08-08, 12:23 PM   #5
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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.
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and you need short stack bolts
These are the same as chainring bolts?
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Old 08-08-08, 12:27 PM   #6
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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.
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.
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Old 08-08-08, 12:53 PM   #7
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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.
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Old 08-08-08, 03:11 PM   #8
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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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