The last time I was in my LBS (where I bought my bike) I showed the mechanic one thing that looked to me suspicious: When I lift the rear wheel in the air (by holding the saddle in one hand) and pedal with the other hand so the wheel turns fast, the wheel is "pulsating" -- pulling up and down. It's not very strong, but quite noticeable. The mechanic told that it's nothing, just "wheel imperfection".
I'm not sure he's right. I also hear clicking noise when riding the bike and it seems coming from the rear wheel. When they put the bike on workstand in the shop, no noise. The mechanic and even the shop owner took the bike for ride around the block and as they came back told me that they cannot hear any unusual sounds or noises.
Now I'm pretty sure about the clicking noise. It's not always there, but once I shift to 4th or 5th rear gear (while on the middle chainring in the front), the clicking noise is very obvious.
It's quite a new bike (I bought it less than 4 months ago). Maybe it's just matter of greasing the BB or the rear hub. Or it's related to what the mechanic called "wheel imperfection"? Not sure what to do about it.
Oh, I've attached an old audio tape-recorder with packaging tape to the seat tube and recorded the noise. Yes, you can hear the click-click noise very clearly in the recording.
Thanks in advance!