I have to tell someone.
A local bike club has slow, medium, fast & very fast ride groups. These are 40-50 mile rides, no racers except in the very fast group, just avid riders.
I joined the fast group, my first outing with this club.
Every bike, except one 1975 Raleigh Pro (Campy Nuovo Record) was CF de jour. This group would drop slower cyclists, and I was concerned that I might spin out, my 44 x 12-25 is good for about 35 mph.
Well, no problem, I did more than my share of leading. A couple riders said "good work-out".