I went to ride my bike today and when I went to pedal something within either the crank or the chainwheel gave off this annoyingly load creaking sound everytime I was on the down stroke, especially on the right foot. It was present on the left foot too, but not quite to the extent. It didn't happen nearly as much or as loudly when I was only lightly pedaling (maintaining the same speed) but when I was trying to accelerate/climb it got quite loud.
I tested and it happened on all three chainwheel gears and all the rear gears, as far as I could tell (definately on all three up front).
Any idea what is wrong?
Thanks in advance.