OK, I know it's not cyclocross, but I figure it's close and definately not a MTB tire question.
It's the Leland Kermesse in IL. The Cat4 race is 100Km. all I know is that it's 90% gravel roads.
My bike is basically a CX bike and will take a 35 rear and even more up front.
but I'm thinking something less, a 30-32 but what say you about tread patern for gravel?