Chiming in, we have spent all spring riding in the Owyhee desert and expect to be in the John Day area this summer as the desert gets to hot. Love that area. Great article by Path Less Pedaled, thanks.Click image for larger version. 

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ID:	17145 I have been caught in the mud, with my fendered touring bike and it was not any fun. Prior to my new Surly ECR, I was riding a Disc Trucker with a 26 x 40 tire and for most of the gravel/dirt roads it does great. The straggler is also awesome. Our group has a huge mix of bikes, primarily Surly's and Salsa's and we strongly recommend the widest tire your bike/brakes can accommodate. For years I took my Rivendell with 650bx40 tires on numerous gravel, dirt roads and did fine unless it got extremely sandy.