Used tubes today. That was my first mistake.
A good friend of mine told me I need to ride a specific trail. She said there's deep gravel in places so don't take my expensive hoops. I've got a set of Ardennes with GP4ks and inner tubes, so that's what I rode. Pleasant trail, good views of the mountain and the river, squatch droppings everywhere though.
Back tire flatted on a wood bridge. It had a bit of a lip and the tube had two punctures, like a snake bite. God dammit, I thought this crap was behind us. I put a new tube in, and flatted again 100 yards down the trail. Looks like I got a blackberry thorn in the tire when I was changing tubes.
I only had one spare. I've gone about ten miles at this point. I'm stuck in the middle of effing nowhere, in squatch infested woods. I'm going to have to tame one, and ride it back to the car. That was my second mistake.
Made my way to the highway (rural one, not freeway) and walked six miles back to the car. Apparently the trail meanders a lot! Think I need new cleats now.