Originally Posted by
eduskator
I think he meant wider tires = heavier tires. At low speed (climb), I'm not sure how significant is the reduced rolling resistance gain.
The 200gm additional weight of wider tires is pretty much irrelevant for climbing - or anything else, for that matter.
And re the aero part - what little you lose in aero, you probably gain in reduced vibration losses. Silca has a really good article explaining that - worth checking out. And if you have a modern wheel, what little aero disadvantage you have at 0 yaw gets offset by better handling at yaw. Eg, Roval Rapides.