The slick center and knobby edges make for two tires in one. Performs flawlessly on the road and on hard pack gravel rail beds. Very happy with them. They do run much thinner than the stated sizes. But I knew that going in.
I've been using Continental Contact Travels in size 37c (1st set) and 42c (2nd set) on my Soma Saga touring frame with canti rim brakes for nearly 9 years!
Lots of broken glass, stray pieces of road cacti, goathead thorns and rugged broken roads with mixed gravel in southern Arizona, and I've never experienced a flat out on the open road! I now know why these tires have a cult-like following. Will buy more of these from BTD best prices and service!