Road and gravel rides on country roads, dirt backroads and rail trails. Rolls fast and sure footed on paved, gravel and dirt trails. I ride the 650B 40mm tire. It is perfect for all I do. Not too wide, not too skinny, sucks up the road imperfection.
I have a pair of Terra Speed on my CX bike and the knobs on the rear were getting low. Moved the front tire to the back and put Terra Trail for the front wheel. Good combination - the knobs on Terra Trail are slightly bigger for better grip, and still rolls fast on pavement.