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My 2008 Specialized Sirrus Pro has about 3000 miles on it. It recently developed a creaking in the crank area when I push the bike forward with the pedals. It does not creak with light pedaling or coasting.

I took it back to my LBS and they tried using teflon tape on some threads in the bottom bracket area and this seems to have reduced it a bit but not eliminate it. FWIW it is more pronounced during my evening commutes (warmer) as compared with the morning commutes.

One theory is that the carbon frame and metal crank parts are expanding/contracting at different rates and causing this to happen; as I mentioned it only started after a few thousand miles.The crankset model is FSA Gossamer MegaExo, 2-piece.

Any ideas on the cause and/or a cure would be much appreciated.
 

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I am not a crank. Sometimes I like to have a little fun at others' expense. Is that so wrong?

If the shop checked it and there is no "play" in the BB/cranks then the teflon tape or similar is all I'd be able to come up with.
 

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Creaks can be misleading in that while it might sound like the crankset, it could actually be comming from the rear wheel.
 
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