Originally Posted by
Bob Dopolina
Please post it when you do. It really could move this conversation along.
Quick summary. Rim version of Specialized S-Works Tramac was faster than disc with all angles. The difference increased as wind moved from right to left due to rotor being on left side of wheel and is blocked more from wind of right by frame, fork and spinning spokes. When wind is 20 degrees from left, the difference in bikes is 8 watts. With other angles typical of most riding, the difference is 1-3 watts