Originally Posted by
Chaplin8
How much "measurably" slower would be the grail, especially climbing?? Not due to extra 1 lb or geometry but because of the gravel tires (I know you said we can always swap them out). The Specialized Diverge Comp comes with a gravel tire, which has a smooth line with heavier treads only on the side. That's not the case with Grail, which is heavily treaded, grippy, besides being 5mm wider.
For me, its about 1-2mph - maybe 10%. Almost trivial if I'm on my own - can be a big deal if I'm on a group ride that doesn't care if they drop someone. Comparing Conti GP5000 32mm to 40mm G-One or similar. I'll say that Conti's 32mm gatorskin or 4-season is about the same as a good Gravel tire.
Climbing - well the difference is mostly rolling resistance which is proportional to speed - so I guess it depends on how fast I am climbing - and a bit for the extra rotational mass.