Our itinerary starts from Porta San Marco, descends towards the first outskirts to go up along the SP73, to Costafabbri; few kilometers but quite busy. At the end of the climb we take the road o the left to Ginestreto, a small village with a wide view over the Val d’Arbia and the Crete Senesi
Following the sign to San Rocco, we reach the Provinciale Grossetana , right in front of a votive shrine of 1889; continuing to pedal on the left, shortly after Fogliano-Mugnano. The road is almost free from traffic, in asphalt up to Fogliano and then becomes a dirt road
We continue pedaling on an asphalted road which soon become a dirt road, downhill ( following the signs to Mugnano) to then return to bituminized along a stretch climbing up to the top. After Mugnano, pedaling along the dirt road that leads to the povinciale 46, is like riding a roller coaster,plunging into the valley and then climbing up the hill in turn. Once on the asphalt, we turn right towards Ville di Corsano
Shortly after Ville di Corsano, on top of a hillock that can be reached with considerable effort, we take a short dirt road on the right to reach the Grotti Castle.
After passing Grotti Alto, we take the Provinciale 23; 6km far from San Rocco a Pilli, a dirt road, initially downhill, with some slopes, very short flat stretch , continuing uphill. After Brucciano, we turn right onto the SC San Rocco -Brucciano which crosses the village with the church of San Salvatore a Pilli to San Rocco a Pilli. We are now 10 kilometers far from Siena, passing from Costalpino through a challenging final climb until Porta San Marco