France · D211
Alpe d'Huez time calculatorfrom Le Bourg-d'Oisans
13.9 km from Le Bourg-d'Oisans at 8.0 %, 1 112 m up. Put in your weight and the watts you can hold for your time to the top, or a goal time for the watts it takes.
The watts you can hold the whole way, as your power meter reads them: about your FTP for an hour's climb, nearer 85 % of it for two hours. Weigh the bike with its bottles.
Your time to the top
On your smart trainer, with Grimpa's pacer bot beside you at that pace. Free.
Times at a glance
A 70 kg rider on a 8 kg bike, at a steady pace from Le Bourg-d'Oisans to the top.
| W/kg | Power | Time | km/h |
|---|---|---|---|
| 2.0 | 140 W | 1:51:19 | 7.5 |
| 2.5 | 175 W | 1:29:47 | 9.3 |
| 3.0 | 210 W | 1:15:30 | 11.0 |
| 3.5 | 245 W | 1:05:21 | 12.7 |
| 4.0 | 280 W | 57:47 | 14.4 |
| 4.5 | 315 W | 51:55 | 16.0 |
| 5.0 | 350 W | 47:16 | 17.6 |
| 6.0 | 420 W | 40:21 | 20.6 |
How it's worked out
On the road's own profile, stretch by stretch: the speed your watts hold on each gradient against gravity, the tyres and the air, which thins as the road climbs. A road bike on the hoods, good tarmac, no wind, and 2.5 % of your watts lost in the chain. Wind, heat and a start too fast all change the real thing: this is the time of a steady, even climb.
Try your pace indoors first
Grimpa draws the real road in pixel art, and your smart trainer feels every gradient. Set the pacer bot to your W/kg and see whether you can hold it to the top before you go.
Alpe d'Huez: the profile, kilometre by kilometre