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Discussion Starter · #1 · (Edited)
Hello all. I'm new to the board and I have been reading through several pages of archived files on "chain" noise. Yet, I am not sure if I found a thread that describes my exact situation.

I just purchased a 2010 CAAD9 5 (with Shimano 105 group) from a LBS. It is factory stock and there is a noise that I just don't think should belong in a new bike. (This is my first nice road bike. My other bike is a commuter/hybrid Giant FCR3 w/ Shimano Altus RD).

First of all, I test rode both a Synapse 5 (Shimano 105 group) and a CAAD9 5 (Shimano 105 group w/ BB30) over a same 6-mile round trip route. Synapse 5 rode so quiet and the shifts were buttery smooth. The only noise came from the tires.

When I rode the CAAD9, it made "chain" noises when using the big ring and middle gears in the rear cassette. The noise was definitely cyclical in nature as it occured in every 1-2 revolution(s).

After the test ride, I knew that I wanted CAAD9 5. But, I wanted the noise to be gone. So, the mechanic adjusted the setup and when I rode it again the "chain" noise was gone. However, the gears did not shift smoothly at all. At one point, riding big ring and going up & down on the middle gears in the rear, the gear would not _downshift_ even after 10-20 revolutions! (Upshifts were fine) So, it got adjusted again. The gear shifts ok (but not as smooth as the same 105 group on the Synapse 5), but now the "chain" noise is back.

In short, (1) what should I tell the mechanic to resolve this noise issue? (2) Or, should I just go to a different bike shop? (3) Or, try to adjust the setup myself?? (If so, what should I tackle first??) (4) I really like CAAD9 5 over Synapse 5, but swap the bikes???? :(

Thanks for reading and TIA for your input.

-Sean (happy about the bike, but frustrated w/ the group/chain setup)
 

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Discussion Starter · #4 · (Edited)
tomcho said:
My first thought was the front derailleur but you are saying the noise only happens on the middle gears of the rear cog? It's silent on the smallest and largest? If so it's not your FD.

What do you mean by middle gears?
I apologize for my poor description, but I am new to the cycling jargon.

What I meant by the middle gears was counting from the smallest gear on the cassette, I start to have noises when I am in 3-6th gear from the smallest one.

I do not have any noise from the smallest and largest rear gears.

Also, I do not have any noises when I am on the small ring up front.

BTW, I have a standard (2 front ring) setup, not triple or compact.
 
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