I am planning to ride the C&O trail this season with a friend of mine. In reading about the trail, it occurs to me that my Sirrus with 700x32 tires would handle it ok as it appears that much of the trail is limestone or other hard pack. My friend says he is leaning more toward a mountain bike. Has anyone done this trail in recent years and do 700x32s seem like a logical choice?? thanks for your input.