Quote Originally Posted by tulip View Post
Cadence is important, but you don't want to be bouncing in the saddle (cadence is too high in that case).
It doesn't mean your cadence is too high, it means your pedal stroke is uneven. If you're not smooth at a high cadence, then you're not smooth at a lower cadence either, it just isn't as obvious.

One way to build an even circular pedal stroke is with cadence drills, either downhill or downwind on an outdoor bike; on rollers; or on a stationary bike with very low resistance. Spin at the fastest cadence you can without bouncing (which can be kind of hard to tell on a stationary bike, but anyway), then increase your cadence by 10 rpm for one minute, and repeat several times.