I just got my bike put togeher.. but I am having a strange problem. When I have it in the smallest front and rear gear, I get this metal hitting metal.. I know it is the chain, since if I put slight pressure on teh chain pushing it in towards the bike it goes away. It is not hiting the de-railer, I am positive of that. When looking straight down on the crank from above, when I turn the crankarms.. it appears that the chain goes in slightly every couple inches causing it to hit the larger chainring. Anyone have any ideas what is causing this? This is my first time to put a bike together from scratch, so might be a stupid mistake I made.