I didn't get the Q Rings, I went with the full-blown Rotor cranks after I had my knee scoped.

I like 'em. I feel my power, as wimpy as it is, is evened out and my knee doesn't complain. My knee surgeon approved, too. As for speed, um, I'm not much of a speed demon without gravity assist, so I really can't help on that. I also got very low gearing, as I'm kind of heavy, and have loaded touring plans. No race gearing for this old girl.

I also went with 165 cranks, just to keep the knees happy. I don't regret that, either.

The bike is a Sun EZ Sport, which suits me down to the ground.