I use Donnelly Strada USH 32mm for winter riding. They actually measure out a little bigger, but still fit easily within my fenders. They have a solid ridge in the middle and roll pretty well on the road, but they do decently in much rougher conditions. And they seem to be pretty flat-proof, which is an important factor in my winter riding. On the other hand, they feel stiffer and heavier than my regular gravel tires, but that's a tradeoff I'm willing to make for winter riding. For me, they do fine on Grade 3 gravel.