I just built my first fixed gear bike. I want to make sure everything is working perfectly on it. However, I noticed that when I pedal quickly or climb up hills, the bottom bracket feels like it's vibrating. When going a constant speed, it feels fine.
Could I have just overtightened the BB? Any other causes? I will be taking it out and experimenting later today.
Here's my bike, btw: http://velospace.org/node/20796