Wider tires vs frames:
see that the Trek Domane with the IsoSpeed frame also has 32mm tires.
How much of the shock absorbtion is the wider tires and how much is the frame?
It would be interesting to mount 25mm and test ride it. But I expect that it also has the wider rims, so even 25mm would be effectively wider.
My HED Ardennes Plus rims are 25.5 mm wide outside, 20.6 mm inside. So my 25mm GP5000 measure 28 or 29mm wide. I run them at 65-70 psi front, around 80 psi rear. Very smooth, and just as fast as narrower rims at much higher pressures. I was running 23mm GP4000 that measured 26mm, but the 25mm tires are only 15-20 grams heavier, and are fast and plush.
I've put 38mm supple smooth tread tires on my other bike, at 38 psi front and 45 psi rear. These just float over new, chunky chip seal and tar joints, quite amazing. They still roll very fast and ride efficiently. But these big tires weigh around 400 grams vs 215 or so, and need heavier tubes.
Last edited by rm -rf; 04-14-20 at 07:11 PM.