These are great tires for mixed surface. I personally use them as a training tire and longer distance. Work great in any gravel but for longer gravel segments or full gravel routes, I would prefer the MSO. The centerline on these tires provide smooth rolling on pavement and the side herringbone pattern is excellent on faster courses and light gravel. I have not used them in any course gravel but I imagine they do well. I use the 60tpi for precaution so they are not the lightest tire, but overall they are fine and unless you are over 2000g in wheels, it is hardly noticeable.