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Old 10-10-08, 07:47 PM   #1
KH1
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FSA K-Force Crank problem

Hi all
I recently (2 days ago) had a K-Force Carbon Megaexo crankset installed. The mechanic was well aware of the facing issue with these cranks and all seemed to go quite good for the first ride - 70Km. Today though I noticed a scraping sound coming out of the BB after about 30Km into a 60Km ride. At first it was just the occaisional scrape. It progressively got worse throughout the ride to the point where it would make the sound for about 1 minute of pedalling then silent for about a minute then back on again and so on.....

Is this an issue that anyone else has come across and what if you have did you do to fix it?

Cheers
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Old 10-10-08, 08:23 PM   #2
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It sounds like the crank loosened up. Take it back to the guy that installed it right away.
It is one of two things: He missed something when putting it together. OR The crank loosened up which sometimes happens witha new crank set.
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Old 10-10-08, 08:34 PM   #3
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Thanks for the quick response.
It's definately in the BB. I just dropped the chain and gave it a spin. It seems kind of tight through the whole cycle. I guess this is normal for new bearings? The sound is very high pitched almost like there is glass in the bottom bracket. Does that make any difference to your suggestion?
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Old 10-10-08, 08:45 PM   #4
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Thru the interweb it is hard to say what the problem is.
The outboard(and ISIS/Octalink) bearings have more drag than cup and ball bearings but they should still be pretty quiet.
So I still have to say, "Take it to the shop" or another shop or even a freind that knows what they are doing.
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