Originally Posted by Baby Puke (Post 16417290)

The OP's spin already looked pretty good to me...

Originally Posted by queerpunk (Post 16416297)

zizou, my first guess would be weight distribution, before aero spokes and wind depth creating turbulence. are you further forward on your track bike? steeper seat tube angle?

also, some people attribute rear-wheel-skip in a sprint to an uneven pedal stroke. you push down but when your crank is at 6, if you don't pull up in time - if you're just the slightest bit out of sequence - then you wind up pushing down, effectively lifting your body somewhat (as if you were starting to stand up - micro movement) and then when you do lift back up, you lift your rear wheel a tiny bit.

Originally Posted by Brian Ratliff (Post 16418371)

With the pedal at the top of the circle, keep your back straight and stiff and drive the pedal down using your hip extensors. So instead of treating your hamstrings in a secondary role by using them to pull on the pedal, you use the muscle as a primary driver as the pedal is going down.
...
What put me onto this was the observation that when deadlifting and squatting, much of the power comes from the hamstrings and the quads seem almost secondary. These motions are not all that different than the pedaling motion, the primary difference is most cyclists ride with soft backs which take the hip extensors right out of it. I tried some things and found a lot more power.