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Old 03-24-07, 02:41 PM   #1
minichamp31
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Cranks loosening

I was riding my bike today and I noticed my cranks were loose. I just got it about a month ago. I tried to tighten them and they were tight, and then I rode it again and the cranks became loose again. Why do the cranks keep coming loose?
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Old 03-24-07, 04:57 PM   #2
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take it to a bike shop. or if your bb is unsealed the bearings may be coming loose and they just need a nip up.

cranks is a fairly general term.
your arms?
spindle?
bottom bracket? what?
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Old 03-24-07, 05:20 PM   #3
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Originally Posted by callumrides
take it to a bike shop. or if your bb is unsealed the bearings may be coming loose and they just need a nip up.

cranks is a fairly general term.
your arms?
spindle?
bottom bracket? what?
I'm pretty sure it's the spindle because I can move it back-and-forth a little bit through the bottom bracket.
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Old 03-24-07, 05:24 PM   #4
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Cranks always come loose, tighten them a lot
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Old 03-24-07, 05:29 PM   #5
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I usually don't post in BMX, but you want to get that crank bolt down real tight. Slip a pipe over the wrench and really give it a good tug. Riding a loose crank will deform the crank arms because they are soft AL and the BB spindle is hardened steel. This will ruin just about any crank fast and coming loose frequently is a good sign damage may have happened.

If it is a new bike, the shop may have screwed this up by under torquing the crank bolts. I would inspect the crank carefully and ask them to make it right if there is damage.
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Old 03-24-07, 05:31 PM   #6
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My cranks never came loose.
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Old 03-24-07, 07:08 PM   #7
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That happens with my bike also. I have to tighten it everyday and when i get it as tight as it goes the next day its loose again.
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Old 03-24-07, 07:10 PM   #8
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That happens with my bike also. I have to tighten it everyday and when i get it as tight as it goes the next day its loose again.
It sounds like you need some Loc-tite(sp?)
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Old 03-24-07, 07:11 PM   #9
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What is this Loc-tite you speak of.
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Old 03-24-07, 07:12 PM   #10
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Quote:
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What is this Loc-tite you speak of.
Stuff that locks the threads. Good stuff.
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Old 03-24-07, 07:19 PM   #11
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Quote:
Originally Posted by minichamp31
It sounds like you need some Loc-tite(sp?)
word. I think this is the first time I've ever agreed with you. You should feel proud.
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Old 03-24-07, 07:22 PM   #12
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You should feel proud.
I do.
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Old 03-24-07, 07:41 PM   #13
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Loctite
Permatex

To get a REALLY good set, use the Anaerobic activator...stay away from the Reds...they are HARD to remove once set (next to impossible)
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Old 03-24-07, 08:05 PM   #14
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get a sawzall and cut them off...
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Old 03-24-07, 08:15 PM   #15
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Quote:
Originally Posted by barba
I usually don't post in BMX, but you want to get that crank bolt down real tight. Slip a pipe over the wrench and really give it a good tug. Riding a loose crank will deform the crank arms because they are soft AL and the BB spindle is hardened steel. This will ruin just about any crank fast and coming loose frequently is a good sign damage may have happened.

If it is a new bike, the shop may have screwed this up by under torquing the crank bolts. I would inspect the crank carefully and ask them to make it right if there is damage.
BMX cranks are almost always steel.
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Old 03-24-07, 08:17 PM   #16
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He doesnt know that because he doesnt ride bmx. he even said so
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Old 03-24-07, 09:27 PM   #17
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It still might screw it up, it's usually a terrible idea to ride things when they're loose.
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Old 03-24-07, 09:38 PM   #18
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your most likely not tightening htem right

first losen the thing at the top of the cranks
then tighten the compression bolts on each side
then tighten the thing at the top
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Old 03-25-07, 05:14 AM   #19
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If he has pinch bolts
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Old 03-25-07, 08:33 AM   #20
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Quote:
Originally Posted by mude
your most likely not tightening htem right

first losen the thing at the top of the cranks
then tighten the compression bolts on each side
then tighten the thing at the top
Thats the way i do it. It still becomes very loose. I'll figure it out sometime soon. Thanks
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Old 03-25-07, 09:54 AM   #21
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Why kind of cranks are they? That is kind of an important factor here. If you have older Odyssey cranks, get dat **** warrentied. If you have profiles, they just develop a bit of a wobble...make sure you have enough spacers and then loctite it. If you have wombots or Flys...they probably don't wobble. If you have primo's may as well take it and get profiles.
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Old 03-25-07, 05:11 PM   #22
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stop sucking at working on your bike
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Old 03-25-07, 06:30 PM   #23
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Lol...i already fixed it.
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Old 03-25-07, 06:44 PM   #24
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Quote:
Originally Posted by barba
I usually don't post in BMX, but you want to get that crank bolt down real tight. Slip a pipe over the wrench and really give it a good tug. Riding a loose crank will deform the crank arms because they are soft AL and the BB spindle is hardened steel. This will ruin just about any crank fast and coming loose frequently is a good sign damage may have happened.

If it is a new bike, the shop may have screwed this up by under torquing the crank bolts. I would inspect the crank carefully and ask them to make it right if there is damage.
the pipes a bad idea. doing that will over tighten it. and most bmx cranks are steel, not aluminum.

i think whats wrong is your bottom bracket is loose, assuming its american. if its unsealed there should be a big nut you tighten. im not 100% sure though i havnt even seen an american bb for a while.
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Old 03-26-07, 07:24 AM   #25
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Locktite them.
Then weld them and make custom Wombolts! (Sarcasm)

If you have one piece cranks...they come loose alot.

Take it to a shop.
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