l'Alpe d'Huez - one for the mortals
About this time last year I posted this item about ascent times of leading professional riders up l'Alpe d'Huez and what power to body mass ratio would be required to do that.
There's a chart which shows the relationship between ascent time and power to body mass ratio (watts per kg - W/kg). It also provides an indication the impact of wind can have on climbing speeds.
Times for leading riders since 2001 are shown on the chart.
The guys over at the Science of Sport blog referenced it in a post here , after seeing it on a cycling chat forum I posted to recently.
Well for a bit of fun (and considering the Tour de France is heading up the Alpe in a few days), I thought I'd post a follow up chart which covers the power to body mass ratio for the rest of us mere mortals.
Here it is:
It's not a hard chart to read.
Want to ride up l'Alpe d'Huez in 1 hour dead? Then you'll need to be able to sustain around 3.75 W/kg, give or take depending on the wind. If you are 70kg, then that's around 260-265 watts.
If you know your sustainable power is 3.4W/kg, then you can expect to get up the Alpe in around 66 minutes.
In calculating these values, I've made a few assumptions (listed on the chart), although the relationship between speed and W/kg on steep climbs is not particularly sensitive to those assumptions.
After power and mass, wind has the biggest impact on speeds when climbing. Hence the two extra lines for head and tailwinds.
At my best form*, I would expect to climb it in around 56 minutes.
How fast have you been up l'Alpe?
* My power to body mass ratio for 1-hour at best is ~ 4.2W/kg (based on my racing power at the UCI World Cup this year), but I have to allow a bit of extra mass for my prosthetic leg. I'll get to do it one day.