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Vuelta Stage 17: The numbers behind a stupidly fast stage

What leads to a 200km day spent at 50kph?

The headline from yesterday's Vuelta a Espana stage was the whopping 50.63kph average speed. But what caused such a rapid stage? We delve into the data and race situation that led to the high pace.


Starting from North of Madrid, the route took the riders across a particularly hot, dry and windy part of Spain. Crosswinds were always going to be a factor on today's stage and due to the Vuelta's rather late start times, the wind only gets stronger as the heat of the day intensifies. 

Vuelta Stage 17 Map

Wind Direction

That leads us nicely onto the wind direction, which was coming straight from the North-East. With the riders heading South-East and South all day, that gives them a cross-tail and tailwinds all day.

Race Profile

Vuelta Stage 17 Profile

Rolling and open Spanish roads invite attacking racing and everyone knows this. That means that GC leaders and sprinters all want to be at the front of the group to be on the right side of any splits. This just ramps up the pace even more.

Stage Start

Tim DeClercq Vuelta Stage 17 Start Data

3km into the stage and we have our first split. Those that are sitting too far back in the group, like race leader Roglic, are in big trouble.

Quick-Step's Tim DeClercq did a lot of damage during the fast start, clocking nearly 80kph despite the positive gradient. The 390w average power and high cadence suggest that this was a very frantic start to the stage.

Teams Represented

With the gap formed it was time to take stock of who had made the front group.

The sizable group contained the Belgian giants Quick-Step who really do love a good crosswind. They were joined by multiple representatives from Movistar, Sunweb, Bahrain-Merida, CCC, Bora and Mitchelton-Scott.

There were multiple teams in this group that had both stage and GC ambitions with Quintana, Knox and Teuns all jumping up the overall classification. This meant that the group was fully committed to making the gap stick.

GC Losers

The big losers of the day, Roglic and Pogacar, were hardly short of teammates. This being the Vuelta, though, meant that many of those teammates are lightweight climbers, taken to support their leaders on the brutally steep climbs. A big group containing the likes of Belgian rouleur Tim DeClercq and British strongman Ian Stannard will always out-muscle teams with only a few climbers to support one stronger rider.

Poor old Tony Martin had the likes of Sepp Kuss and George Bennett to help manage the gap. Bennett's day of chasing was long, spending three and a half hours rolling through and off with his Jumbo Visma teammates. He spent his day at 284w average, though due to the surge and stop nature of this effort, his normalised power or weighted average will have been significantly higher.

With his leader Roglic following a smaller group of GC favourites into the finish, the tired Jumbo Visma team rode into the finish together, eventually losing a whopping 25 minutes to stage winner Phillippe Gilbert.

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Liam Cahill | 4 years ago

Bennett only moved ahead of Quintana after stage 17. I didn't see any pics of Bennett in yesterday's stage, but today should be telling as Valverde now 'has' the jersey. Wonder if he'll defer wearing it in favour of the bands?

kil0ran | 4 years ago

Ah, because Bennett is Irish National RR champ...

kil0ran | 4 years ago

Why is Quintana in Green? I know Roglic is points leader but Sam Bennett is 2nd in the sprints classification. Pogacar is 3rd but wearing the Young Riders jersey, and Quintana is 4th. Why Quintana and not Sam Bennett?

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