I had a nice tailwind (25MPH) over a very bumpy gravel road today. It left me with a creaky left crank. I have tried to tighten the pedal and the noise is still there.
With both pedals horizontal and equal weight on my cranks i notice no noise. When I pedal forward i don't really notice the noise much. When I put the weight on the left pedal and pedal backwards i really hear the noise. I suspect that my crank arm is loose.
What tool can i go out and buy to give this a tightening. It has a hex type head but I don't know the size. My bike is a Trek 4300 if that helps. I am very sure that it is in the crank. How can i tell if it is loose other than just trying to tighten it?