I'm a little concerned about my bike. I was riding along when I heard a loud cracking sound. Since then it sounds like there is some vibration coming from the rear wheel. I checked the cassette teeth but they all seem to be intact. The chainset teeth are fine. The bottom bracket is fine with no play. The jockey wheels seem fine. I can't even feel any play in the cassette.......yet this sound is still apparent since the initial cracking sound. It might not be component fault.....perhaps a loose freehub....????? Im not too pleased.....I just spend loads on my new bike.......now I've got to contact the shop tomorrow to get it back in. I hope they dont charge me....seeing as I've had it for only 8 days!