From Massa Marittima, take the S.P. 162 towards Siena. After passing through Ghirlanda, continue straight along the valley road, which is mostly uphill, until you reach Pian dei Mulcini (4). After 700m, when you come to an ‘osteria’, bear left and follow the signs for Monterotondo and Larderello before joining the S.R. 439 which, after passing through Pian del Mucini (3km of level ground), starts to climb steeply. Continue following the signs for Larderello. After around 4.5km, there is a downhill stretch for 1.5km and then you’ll begin to climb once more for a further 3km until you reach a fork in the road (16.7). Here, bear left, heading towards Monterotondo along the S.R. 398 “Val di Cornia”. The uphill section ends here and you’ll soon start the downhill ride towards the village of Monterotondo (20).