With its 48 hairpins and an average gradient of 7.4% over a relentless 24.3Km of climbing, this is the most famous - and the most difficult - of the three routes to the summit at 2758 metres/9050 feet.
| Duration | 1:50:21 |
| Distance | 24.68kms |
| Elevation Gain | 1785m |
| Toughness | 843 |