The trail is also great for hikes with family.
I road the F Trail a few years ago when I was living in Germany. It was claimed to be the best singletrack in the world. I haven't ridden all of the singletrack trails in the world, so I don't know if it was the best. However, it was well worth the 1+ hr drive from Wiesbaden.
The trail is a 25+ mile loop that encircles the town of Rodalben. It is about 23 miles from Ramstein Air Base and K'town.
The trail is well-marked with an F short for Felsenwanderweg. There are several trailheads to start from multiple points.