STRATEGY

 

What speed will you need to do to complete the Etape within the time limits?

 

The analysis below is for a rider starting at the back, and stopping at each food/drink station for 10 minutes.

 

This year uphill gradients are of three main types:

 

2% - 2.5%  : First part of Isoard, Lauteret

 

4.5%: Top part of Lautaret

 

7% to 10%: Top part of Izoard, most of Alpe d’Huez.

 

There gradients are averaged over several miles. There are steeper bits (11% to 14.5%) where your speed will be lower, and there are gentler bits (there are even down hill sections on most climbs!)

 

The analysis shows that suitable speeds to just finish in time are:

 

Flat: 19mph

 

1%: 15 mph

 

2% - 2.5%:  11mph – 12 mph

 

4.5%:             8.3 mph

 

7% to 10%: 4.7mph – 5 mph

 

This is a “skin of the teeth” ride!

The figures are based on a 75 kg (12 stone) rider producing 150W of mechanical power.

 

To finish with a decent margin (nearly 2 hours) starting at the back and stopping for 10 minutes at each food/drink station, speeds would be:

 

Flat: 21mph

 

1%: 18 mph

 

2% - 2.5%:  13mph – 14.5 mph

 

4.5%:             9 mph

 

7% to 10%: 6.5 mph (average)

 

The figures are based on a 75 kg (12 stone) rider producing 200W of mechanical power.

 

DISCLAIMER: these figures are only estimated, though they are based on scientifically derived data tested out on the road. They may contain inaccuracies, but should give you a quite good idea of the sort of speeds needed to complete the course.

 

DETAILED ANALYSIS

 

Section

Length

Gradient

150W

T

200W

T

 

 

 

 

7:30am

 

7:30am

Gap – Embrun

 

21 miles

flat

19 mph

1.1hr

21 mph

1 hr

Embrun - Guillestre

12.7 miles

0.8%

15 mph

0.84 hrs

18 mph

0.7 hrs

Guillestre

 

 

 

9:27am

 

9:12

Guillestre

 

 

 

9:37am

 

9:22

Izoard 1st part

13.4 miles

2.6%

11

mph

1.23 hrs

13 mph

1.03 hrs

Izoard 2nd part

6.6 miles

7.73%

5 mph

1.32

6.5 mph

1.015 hrs

Izoard descent

12.75 miles

 

25.5 mph

0.5 hrs

25.5

0.5 hrs

Briancon

 

 

 

12:40 am

 

11:55 am

Briancon

 

 

 

12:50 am

 

12:05 am

Lautaret 1st part

11.3 miles

2.1%

12 mph

0.94 hrs

14.5 mph

0.78 hrs

Lautaret 2nd part

6.5 miles

4.5%

8.3 mph

0.78 hrs

9 mph

0.73hrs

Lautaret – Bourg d’Oisans

24 miles

 

20 mph

1.2 hrs

24 mph

1 hr

Bourg d’Oissans

 

 

 

15:45

 

14:36

Bourg d’Oissans

 

 

 

15:50

 

14:46

Alpe d’huez

9 miles

7.6%

4.7 mph

1.92 hrs

6.4 mph

1.4 hrs

Finish

 

 

 

17:45

 

16:10

Closes

 

 

 

18:00

 

 

 

 

 

Good luck! Enjoy!