Fun cycling activity, traffic free
So far I’ve only done it a few times from Ponte Milvio to Saxa Rubra, which is around 11km long.
In addition I’ve gone beyond Saxa Rubra 3 times –
once to Isola Farnese, going through cassia bis, via Francigena and returning home through the ciclabile of lungotevere
Another option is cassia bis only until via della Giustiniana, then the via Francigena through the park of Insugherata and the ciclabile of monte Mario until the vatican
A third time I left the cycling path was to cross the tevere, north on via Salaria and cross through rural road of via della Marcigliana