Mostly hard packed gravel roads made of hardpack and some looser gravel. The tires roll very well and handle some chunkier sections just fine. I like the durability of these tires and the handling.
I bought this tire for my gravel bike. I have been using the Goodyear Contender tire (40mm) which has been great, but wanted something a little smoother as my tread would wear out anyway. Since I use my bike 90% of the time for commuting on mostly paved roads and bumpy bike trails, it didn't make sense to have a tire with treads. This has been a great choice, as it can run over anything but also picks up the speed of my bike and has less rolling resistance (almost as quick as my road bike with 28mm tires). I have also used it on gravel roads during weekends and it does a good job and you can fly on the roads. However, I wouldn't recommend it for climbing steep terrain on loose material. That said I did climb some steeper gradients on gravel and it was fine. Works great in the rain. Good tire!
Most of my riding on this tire has been on grit-ridden paved urban surfaces and occasional hardpack gravel. Tire is fast and firm - I've found it much more durable and less prone to flats than Schwalbe G-One RS.
