Originally Posted by
Lemond1985
While more comfy, wide tires are slow as a dog on climbs. I need all the help I can get in that area, so I always run the narrowest tire I can get by with. Not a big devotee of the "wider is always better" cult. YMMV.
I think you have this backwards. Rolling resistance goes DOWN as you go wider on tires, although I certainly agree that there is such a thing as too wide. What goes up with wider tires is aerodynamic drag.
See the below rolling resistance test of GP5000 tires at various widths. Rolling resistance decreased from 10 watts to 9 watts when comparing a 25mm to a 32mm. In other words, the wider tire rolls easier. Unless there is some aspect of wider tires and climbing that I’m missing.
GP5000 tire width rolling resistance test