Started my time trial ride to test out some new tires but heard some horrible creaking coming from my frame. I think I might have messed up a dropout or cracked a chain stay. Headed to the bike shop after the first loop and they checked the entire drivetrain and couldn't find a problem. After snugging up my bottom bracket, cranks, sprockets, etc, bike felt better but is still making a bit of a creak when I'm pushing a big gear fast.