Originally Posted by LóFarkas
Sounds too high. Of course, if by "average rider" he means a guy using an MTB with knobbies doing 12mph, then okay. A guy on 700*23 slicks doing 18mph will probably not have rolling resistance that high.
Don't forget to count the resistance of the hub bearings also. Considering the frame drag is 8%, 12% for rolling resistance doesn't sound too ridiculous.
Also, I'm not a physicist, but I would guess that rolling resistance decreases very little as speed increases. I think that since drag becomes much more pronounced at higher speeds you can't tell that the rolling resistance is there, but I think it still is. Just thinking out loud here.