I am using gravelking sk in 38mm. I am not sure if I could go larger on my current bike. I would probably be happier with a bigger tire for descending mountains with loose gravel. I think they ride fine on pavement. It all depends on the state of the gravel roads that you ride on. I had 20 pinch flats the last year I rode 30mm tires, the local gravel roads feature a lot of large rocks that are barely visible, but are sticking up enough to cause pinch flats. Going from the 30 to 38 didn't slow me down at all and no more pinch flats. Of course, going tubeless had something to do with that as well.