It is the CAI 207g trail.
Going down from Viale Europa on asphalt and then on a dirt road along Via Romania, a beautiful trail begins in the woods that, with the crossing of two fords of the Cremera stream, allows us to reach the splendid Valle del Sorbo. The trail is easy, slightly downhill coming from Via Romania, and then completely flat along the banks of the stream in a beautiful gorge with a couple of waterfalls. The trail is completely rideable, without rocks or steps.
The two fords, if you are on foot, are crossed by walking on stable stones with the help of trekking poles; with a lot of attention you can pass and not get your feet wet. The flow of water should never be excessive as the sources of the Cremera are a couple of km before, near the sanctuary of the Madonna del Sorbo. The three of us, with bikes, did not get wet. To be safe, bring two plastic bags to cover your shoes. The trail is not suitable for families with children in strollers.