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Col d'Izoard: the climb, its Grand Tour history and records
Col d'Izoard: each side of the climb, every Grand Tour passage since 1996 and the records, each figure with the source it comes from.
The climb
Provence-Alpes-Côte d'Azur (Hautes-Alpes), France
| Side | Start | Length | Elevation gain | Average | Max | Summit | Hairpins | Source |
|---|---|---|---|---|---|---|---|---|
| Briançon (north) | Briançon | 19.2 km | 1178 m | 6.1 % | 11.6 % | 2361 m | 13 | climbfinder.com |
| Guillestre (south, full, via Combe du Queyras and Arvieux) | Guillestre | 34.3 km | 1541 m | 4.3 % | 12.0 % | 2360 m | — | cyclingcols.com |
| Château-Ville-Vieille (south, via Arvieux and Casse Déserte) | Château-Ville-Vieille | 14.2 km | 1040 m | 7.3 % | 14.7 % | 2361 m | 13 | climbfinder.com |
Each side from one source, linked. A dash: the sources we opened disagree or give no figure, so we leave it out.
In the Grand Tours since 1996 10
| Year | Race | Stage | Type | Stage winner or first over the top | Source |
|---|---|---|---|---|---|
| 2019 | Tour de France | 18 | Crossed | Damiano Caruso | en.wikipedia.org |
| 2017 | Tour de France | 18 | Summit finish | Warren Barguil | cyclingnews.com |
| 2014 | Tour de France | 14 | Crossed | Joaquim Rodríguez | en.wikipedia.org |
| 2011 | Tour de France | 18 | Crossed | Maxim Iglinsky | cyclingnews.com |
| 2007 | Giro d'Italia | 12 | Crossed | Danilo Di Luca | en.wikipedia.org |
| 2006 | Tour de France | 15 | Crossed | Stefano Garzelli | en.wikipedia.org |
| 2003 | Tour de France | 9 | Crossed | Aitor Garmendia | en.wikipedia.org |
| 2000 | Tour de France | 14 | Crossed | Santiago Botero | en.wikipedia.org |
| 2000 | Giro d'Italia | 19 | Crossed | Francesco Casagrande | autobus.cyclingnews.com |
| 1996 | Giro d'Italia | 14 | Crossed | Pascal Richard | en.wikipedia.org |
Records
| Record | Rider | Time | Year | Source |
|---|---|---|---|---|
| Château-Ville-Vieille (south, via Arvieux): fastest race ascent (watts2win segment 13.96 km, 7.08%) | Warren Barguil | 0:38:00 | 2017 | watts2win.eu |
| Château-Ville-Vieille (south, via Arvieux): fastest race ascent (watts2win segment 10.50 km, 7.62%) | Warren Barguil | 0:29:26 | 2017 | watts2win.eu |
A time is listed only where the sources agree on it; where two sources give different times for the same ride, it is left out.
How long would it take you?
Your time up Col d'Izoard at a steady power, from a physics model.
Advanced: rolling resistance and drag
Estimate from a physics model (Martin et al. 1998), on the average gradient. Wind, surface, pacing and steep sections change the real time. More cycling tools
How this is calculated
P × 0.977 = ½ · ρ · CdA · v³ + v · m · g · (sin θ + Crr · cos θ), θ = arctan(average gradient), m = rider + bike, g = 9.81; solved for the speed v, time = length / v. Air density ρ: NASA GRC troposphere: T=15.04-0.00649*h; p=101.29*((T+273.1)/288.08)^5.256; rho=p/(0.2869*(T+273.1)); h = mean of start and summit altitude. Sources: Martin et al. 1998, J Appl Biomech 14(3):276-291 — https://collections.lib.utah.edu/ark:/87278/s6jd5f71; Defraeye et al. 2010, J Biomech 43(7):1262-1268 (upright position, cyclist+bike 0.270 m2) — https://lirias.kuleuven.be/retrieve/232736; NASA Glenn Research Center, Earth Atmosphere Model (metric) — https://www.grc.nasa.gov/www/k-12/airplane/atmosmet.html. Climb geometry: the side's source in the table above.