At the same pressure a bigger tire is firmer and deforms less, so "same pressure" is not an apples to apples comparison. Once you correct the pressure so the tires have the same amount of tire drop. which means less pressure in the larger tires, a 32mm, a 28, 25 and a 23mm of the same kind all offer basically the same rolling resistance.

You can ride a wider tyre without penalty except weight and (unless you have super expensive very wide rims which most of us don't) aerodynamics, but on actual roads, unless you're a heavyweight and have a problem with pinch flats, I just don't see the point of doing so. I would say, if you need comfort, just drop 5 psi from the tires and see how you get on with it, easier than changing the tires. If your roads are crappy, dropping the tire pressure might even lower the rolling resistance on the worse parts of the roads. If you start to have issues with flats at lower pressures then it's time for a wider tire.

Maybe the new fad of 2029 will be adaptive tire pressure where the bike automatically deflates and inflates your tires based on the road surface ;)

Anyone tried Conti GP 4 Seasons 28c to 32c?

Your thoughts?

Thanks!

What pressure does a 23 need to match a 32 at 60 psi?

GP 5000 32c on 2020 Domane Aeolus Pro 3v
 

Girlfriend recently bought a new 2020 Domane SL 7 eTap with the Aeolus Pro 3v rims. She loves the bike. In preparation for a week-long supported Cycle Oregon ride (with lots of climbing and potentially wet chip seal roads), I'm thinking of replacing the 32c Bontrager R2 Hard Case Lite tires with the new GP 5000 32c to give her some better wet traction (have read reviews of the R2 that poor on wet roads) and maybe a lighter setup. Anyone try the GPs on those wheels yet or some others?