i just figured out why it was so loud, while riding on my trainer. i have a triple crank. im using the middle. but when i shift up more (larger cogs) it gets louder. but when i shift the smallest crank and shift down towards smaller cogs, the noise is gone. i didnt shift to either extremes and the noise was gone. so i was wondering why it would be louder with a larger crank than small? is it because there is much more tension than the small? so my chain could be too short?