Every time I pedal, and the cranks go once around, theres a clicking noise. It's not high pitched do I don't think it's my cranks. My dad, who knows what he's talking about, told me if i here my cranks creaking, get of my bike. But I don't know the difference between the noise that bikes make and the noise cranks make when they're loose. If I got off every tim emy bike made a nose, I'd never be able to ride. Any ideas? Thanks, Will