Originally Posted by
ksryder
For 50 miles of road and 10 miles of gravel I would probably stick with a road tire but go wide, something like the Challenge Strada Bianchi or the Gravelking slicks that
mstateglfr mentioned. Won't be too hard to improve on the gatorskins, which don't have especially good traction on pavement, let alone dirt. My experience with the Challenge tires is that they have not slowed me down on asphalt.
I run the 27mm Paris-Roubaix (the skinnier Strada Bianchi) on my road bike, set up tubeless at 65psi, and they are fast, and work quite well on cobbles as well as the occasional gravel secteur so long as it is not littered with roots and big loose rocks. I have no doubt that the Strada Bianchi perform as well, if not better.