Quote Originally Posted by Cooter View Post
You're wrong dawg. It will affect rpm slightly. Get in a 30 mile per hour headwind and check rpm at 60 mph. Turn around and go back the other way on the same road with the same wind. There will be a difference. The wind is in effect a "load". More weight on the bike like riding two up on a hill will make a difference also.
It doesn't matter if you're down hill with 50 kts on the tail, or up a hill pulling a boat - if you're in the same gear, at the same speed, the RPM will be the same. Unless physics and mechanical engineering work differently in the USA....