Col de l'Iseran
Bourg-Saint-Maurice · French Alps
47.5 km
km
1955 m
D+
4.1%
avg
10%
max ramp
Europe's highest paved pass at 2,764 metres: 47.5 km from Bourg-Saint-Maurice past dams, alpine pastures and tunnels. Half a stage on its own, often with snowbanks at the roadside even in July.
Publicidad
FAQ
When is the best time to climb Col de l'Iseran?
From June to September, when the Alpine passes are clear of snow. Always check seasonal openings and any tolls before heading out.
What gearing do I need for Col de l'Iseran?
An average gradient of 4.1% calls for easy gearing: a compact crankset and a wide cassette. On ramps beyond 15% even strong riders appreciate a 34x32 or easier.
What's the steepest section of Col de l'Iseran?
The steepest ramp hits 10%, almost double the average gradient (4.1%): over 47.5 km total, that's where the climb is won or lost. Keep something in reserve for it.