These are the most near cycle tracks:
 
Via Appia Antica (from Ring Road to S. Sebastiano catacomb) Km 10 long: A very nice walk along the ancient Roman road rich of beautiful natural and archeological sites.
 
Appio Cluadio Aqueduct Park Km 5 long: Extremely evocative green zone full of the rests of ancient Aqueducts.
 
For another Rome's cycle tracks seek throughout the links at our page:
some useful links