Originally Posted by
RockiesDad
So what about going to 30mm or even 32mm? Are we hitting the point of diminishing returns going up in size for road bikes???
It's probably too personal to pin down to any specific point. I went from ~25mm to 28-30mm about eight years ago, and pivoted almost exclusively to 38-42mm tires a couple years ago. They don't seem to slow me down much at the speeds I ride, and my body is much happier afterward.
I don't expect pros and the roadies imitating them to go much beyond 25-28mm for aero/weight reasons, though.
Thankfully, a combination of factors have gone into loosening up the clearances on road bikes, so everyone can find that sweet spot for themselves.