Originally Posted by
ancker
Sidenote: I did notice I was able to hold my speed at lot easier on Saturday with my 58mm wheels vs my 30mm wheels. Usually when I fall off the back I slow down to 18-20. On Saturday I was able to hold 21-22 mph. I can't say for certain the 58mm wheels are to thank for this, they probably only helped a small amount.
As AdelaaR said above, they certainly bring a nice placebo effect.
For reference, an increase in speed from 20 to 22MPH takes about 30% more power. You definitely won't get that much help from a set of wheels.