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Which Tour of Flanders climb is the hardest? We asked the riders.

They might look superhuman on the cobbled climbs, but pro riders admit that the Flanders hills are brutal and have insight on which ones make or break the race.

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The Tour of Flanders sends the world’s best classics riders on a 266-kilometer trek from Antwerp to Oudenaarde. Along the journey, the peloton will tackle Flanders’ 17 helligen, including the infamous cobblestone climbs Koppenberg, Oude Kwaremont, and Paterberg.

All of these bergs dish up leg-cracking pain. And before the riders even reach these climbs, a chaotic battle always ensues within the crowded peloton as the riders jostle for the best position.

Which berg hurts the worst? Which features the most aggressive fight for position? Which one most regularly decides the race?

Again, journalists like me can be armchair quarterbacks when debating the merits of the Tour of Flanders’s 17 climbs. But the riders know best.

So, I conducted another highly unscientific poll to understand what the pro peloton thinks of these painful bergs. With previous polls, these questions delivered decisive answers. However, the peloton returned split opinions to my questions around these bergs. Here’s what I found out:

Photo: Tim de Waele | Getty Images

Which hill is hardest?

Verdict: Koppenberg or Oude Kwaremont

One climb is the steepest and the other is the longest. Both the Koppenberg (22% maximum, 600 meters) and the Oude Kwaremont (11.6% maximum, 2,200 meters) received a plethora of nods when I asked riders which climb is the hardest. A distant third place was the Taaienberg (15.8% maximum, 530 meters).

It’s understandable why riders would choose the Koppenberg, which is so steep that riders must push maximum watts just to make it to the summit. And the road is unquestionably narrow, which causes frequent bottlenecks. Every year, TV cameras catch dramatic images of those unlucky riders who are stopped behind a traffic jam, unclip, and walk to the top.

“It’s really steep, and if it’s a little bit wet it is the hardest to make it to the top,” said Dylan van Baarle (Sky).

“It has probably the worst stones and steepest gradient,” said Silvan Dillier (Ag2r La Mondiale). “You cannot stop pedaling or you have to unclip.”

The challenge of the Kwaremont comes with the pacing. At 2,200 meters it is the longest, and the climb is split into two halves, with a long false flat section of cobblestones coming at the top. That long and painful flat section is where three-time winner Fabian Cancellara often accelerated away from his foes, who had tired themselves out by pushing too hard on the climb’s steep midpoint.

Plus, the riders tackle the Oude Kwaremont three times.

“You have the climb, you come into town, and then you have the big flat sections of cobbles to deal with as you try to get up to speed,” said Jack Bauer (Mitchelton-Scott). “It just hurts every time, and we do it three times.”

“It is not finished at the top and you have to keep riding on the cobbles,” said 2015 Flanders winner Alexander Kristoff (UAE Team Emirates). “If there is just a few percent difference between riders, on the [Kwaremont] is where that one or two percent has a lot to say.”

It’s common to see riders dismounting their bicycles on the Koppenberg. Photo: Tim de Waele/Getty Images

Most aggressive fight at the bottom

Verdict: Oude Kwaremont (second ascent)

You can’t win Flanders at the foot of a berg, but you can definitely lose it. That’s why a brutal and chaotic fight ensues in the kilometers before each climb, as riders jostle for a front position. Riders said that one moment specifically creates the most aggressive and chaotic battle for position: the kilometers before the second ascent of the Oude Kwaremont. The fight comes 214 kilometers into the race.

“That’s the moment that makes the difference, so everyone wants to be there,” said Tiesj Benoot (Lotto-Soudal). “It’s a really wide downhill into a small road before the climb section.”

Indeed, the riders come off of the Kanarieberg and embark on a frantic downhill fight before taking a sharp right-hand turn onto a road that is barely wider than a typical American bike path. The peloton then makes another right-hander onto the Oude Kwaremont, which has historically been a launchpad for the first of the race’s final decisive moves.

Good positioning at the base of the Kwaremont can advance a rider to the next section of the race. Bad positioning, by contrast, can doom a rider’s overall chances.

“The second time up Kwaremont, that’s where the race ends for three-quarters of the peloton, and for one-quarter of the peloton, that’s where it starts,” said Bernard Eisel (Dimension Data). “Even if you’re still in the race, you’re just a victim if you’re in the back of the bunch at that point.”

Photo: Tim de Waele/Getty Images

Which hill decides the race?

Verdict: Oude Kwaremont or Paterberg

Cancellara went on the Kwaremont. Sagan went on the Paterberg. Philippe Gilbert went on the Muur van Geraarsbergen, but his long-range attack is an outlier from the Flanders norm. Most riders told us that the most decisive climb of the Tour of Flanders is either the Oude Kwaremont or the Paterberg, due to each climb’s position near the end of the race.

“The really big guns always come out on the Kwaremont, and if they are on a really good day, they can drop everyone there,” said Jens Debusschere (Jumbo-Visma). “It’s late in the final of the race. The magic happens there.”

The final ascent of the Oude Kwaremont comes with 19 kilometers remaining in the race, and the Paterberg follows shortly thereafter with 13.5 kilometers. Riders are fatigued, both physically and mentally. These two climbs are often when tactics and strategy give way to guts, riders said.

“It’s the Paterberg,” said Stijn Vandenbergh. “And I always suffer there because of my weight.”

Most dreaded

Terpstra passed the leaders on the Oude Kwaremont. Pedersen would prevail the best of the three and was able to power on to the finish to capture second place. Photo: Tim De Waele/Getty Images

Verdict: All

The climbs of Flanders present a serious challenge to all riders, even seasoned pros. And since they are of varying lengths and steepnesses, these climbs present a different challenge for all of the riders in the bunch. When asked which climb the riders dread the most, they gave me a variety of answers.

“It’s the Koppenberg because you start at zero miles per hour into it,” said Mitch Docker (EF Education First). “You can see the whole thing from bottom to top. It’s just not fun.”

“The Kwaremont is the place where it really hurts,” said Michael Schar (CCC Team). “It’s so long and it stays flat at the top.”

“It’s the Taaienberg. I don’t know why I always suffer there,” Debusschere said. “I was never in a good spot for it, and someone always goes full gas and when we go over the top, the group splits.”

Some riders simply shook their heads at this question and proceeded to name multiple climbs. Often, they said, it’s the scenario on the road that dictates whether a rider anticipates, or dreads, a coming climb.

Mads Pedersen (Trek-Segafredo) put it succinctly.

“All of them, they’re all so hard,” Pedersen said. “The Kwaremont is a s—t hard climb. The Koppenberg is a s—t hard climb. All of them are horrible.”