Originally Posted by
rushbikes
I made mention of rolling resistance in my post. It is considered close to nominal when compared with wind resistance. I do not recall the exact numbers (that calculator link probably distills them), but there have been plenty of posts in this forum supporting this.
Why not do the calculation and be done with it.
http://www.analyticcycling.com/ForcesSource_Page.html
Rolling resistance using defaults, 304.5 gmf (2.98e5 dyne). So at 20 km/hr it takes 16.6 W to overcome rolling resistance; at 60 that grows to 49.8. Whether a difference of 33 W matters is up to the individual.