The most challenging stretch involves the legendary "Porrettana" up as far Sambuca and the little-known Valle del Limentra. Starting from Pistoia we suggest you take the "Porrettana" or the SS 64, which until 1847 was the only connection between the city of Bologna and most of northern Italy. The route passes through the town of Signorino, which is a well-known meeting place and stopover for motorcyclists. Following on from that is the Collina Pass which has an altitude of 932 mt a.s.l. It is said that Hannibal travelled through here during the Second Punic War along with the infamous elephants. You can then cross San Pellegrino, Bellavalle and Taviano, with the possibility of making a small detour to the castle in Sambuca Pistoiese (736 mt), passing Ponte alla Venturina along the Suviana basin, travelling between 40 and 50 km.