In instantaneous speeds yes. I also agree that it does so sinusoidally, and that at any point on the rotation of the wheel a point will have a related point 180 degrees away that has the same absolute value velocity.
But most people dont have the math background to really grasp that concept in a good enough sense to really appreciate what you are saying.
The average person thinks of speeds, velocity and even acceleration as one concept and in averages. If you go 60 miles in an hour you were going 60mph, even though you may very well have gone 0mph for 30 minutes and 120mph for the other 30 minutes.
Ill share a real life example of how the "average person" has trouble with these things. I regularly tutor people in my major (especially on mathematically involved classes like micro or labor) and one of the most common misunderstandings I see is that people think that solving a derivative at one point on a graph gives you the slope of the ENTIRE curve which may (or most likely, may not) be true because they dont understand the difference between slope at a discreet point, overall slope and average slope.
FWIW I think its a very interesting discussion.