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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 06-15-09, 04:30 PM   #1
racercyklisten
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Awful cracking sound

In recent times there has been a terrible noise (crack) from my bike. It comes from the area around the bottom bracket/cranks. I have changed the chain recently, taken off the pedals, crank and bottom bracket and given them a proper lubrication. But the sound is still there.

It occurs only when I press hard on the pedals, or when standing up in the slopes. Could it come from the cranks? My bike is a Pinarello F4:13 (MY 2006) and the crank is labeled "Pinarello" but I suppose they come from Campagnolo. Other components are a hybrid of Campa Chour and Centaur.

http://www.nakan.ch/blog/files/pinar...lo_f4_13_1.jpg
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Old 06-15-09, 04:37 PM   #2
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What kind of grease did you use to properly lubricate the bottom bracket?
If you used oil (or WD40, which is not a lubricant at all, but a solvent which will rinse away your grease) you may need new bearings, races & cups.
I hope that's not the case. Good luck.
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Old 06-15-09, 10:24 PM   #3
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It could be cracked cranks or a cracked BB shell that only opens visibly when you're bearing down.
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Old 06-15-09, 10:29 PM   #4
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Quote:
Originally Posted by calamarichris View Post
What kind of grease did you use to properly lubricate the bottom bracket?
If you used oil (or WD40, which is not a lubricant at all, but a solvent which will rinse away your grease) you may need new bearings, races & cups.
I hope that's not the case. Good luck.
Nah.

WD-40 is not a particularly GOOD lubricant, but it is a lubricant.


I'm sort of thinking crack in the shell, too. Get it under a really good light and check it out with a magnifying glass....
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Old 06-16-09, 06:22 AM   #5
racercyklisten
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Originally Posted by calamarichris View Post
What kind of grease did you use to properly lubricate the bottom bracket?
If you used oil (or WD40, which is not a lubricant at all, but a solvent which will rinse away your grease) you may need new bearings, races & cups.
I hope that's not the case. Good luck.
I used Pedroīs grease. Rather expensive, so I suppose itīs good.
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Old 06-16-09, 06:33 AM   #6
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I had a similar problem and thought for sure it was in the bottom bracket. I had my mechanic take it apart, lube, and reassemble it twice with no luck; I was really getting pissed off. It turns out that the problem was a broken pedal bearing, I replaced the pedals and now it’s perfect. I discovered the pedal was broken by clipping into one side (leaving the other side unclipped) and pedaling and then trying the other side. In my case the right side was quite and the left side made the creaking sound. Your creak might not be the same problem, but it’s worth a look. Good luck!
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Old 06-16-09, 06:47 AM   #7
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Read through this for some ideas.

I need help diagnosing two noises. I am at a complete loss!

Good luck though, hopefully your sound is as minor as mine was.
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Old 06-16-09, 06:57 AM   #8
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Mine turned out to be a lose headset. Sound travels through the frame so it's important to check out the non-obvious things as well like skewers mentioned in the other thread.
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Old 06-16-09, 11:19 AM   #9
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http://www.pegasusautoracing.com/gro...upID=CRACKTEST
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