Bike Check: Jordan Sarrou's World Champs Winning BMC Fourstroke

Oct 19, 2020
by Daniel Sapp  

World Championships delivered a unique set of conditions that were as unfavorable as many riders could imagine. However, they seemed to favor Frenchman Jordan Sarrou. Taking the holeshot, Sarrou was on the gas from the start of the race and never looked back. With strong legs that carried him all the way through the finish, he navigated some downright treacherous terrain onboard his BMC Fourstroke.

The Fourstroke is built out with SR Suntour suspension, Duke Racing wheels, and SRAM's AXS drivetrain paired to a 34t chainring, along with SRAM Level Ultimate brakes. For a dropper post, the frame uses BMC's own integrated RAD Autodrop that has 80mm of travel.

For tires, Sarrou ran Vittoria's Barzo front and rear. The tires were custom cut by his mechanic for optimal traction in the muck.

Jordan Sarrou your 2020 world champion.
Rider Name Jordan Sarrou
Age: 27
Homecountry: France
Height: 5'11" / 180cm
Weight: 143 lbs / 65 kg
Instagram: @jordansarrou

Sarrou in disbelief of what he just achieved.

Sarrou's BMC Fourstroke was firing on all cylinders for World Champs.
BMC Fourstroke
Frame: BMC Fourstroke, size large
Shock: SR Suntour Edge
Fork: SR Suntour Axon Werx 34, 100mm
Wheels: Duke Racing
Tires: Vittoria Barzo, custom cut, 2.1". 1.25 bar.
Drivetrain: SRAM XX1 Eagle AXS, 34-tooth chainring
Brakes: SRAM Level Ultimate
Size: Large
Weight: 10.7kg / 23.6 lb
More info:BMC

Speckled with the earth.

Sarrou crossed the finish line with some of the course stuck to his bike, including a twig wrapped around the front hub.

That spring is part of BMC's AutoDrop dropper post - push the remote on the handlebar far enough and the post will lower on its own. It's charged up via a floor pump, which gives it more than enough actuations to get through an entire race.

A SRAM AXS Eagle drivetrain with a 34 tooth chainring.

At least there's no need to worry about contaminated cables and housing.

There's a 2.1" Vittoria Barzo hidden under there somewhere.


  • 34 1
 Proprietary autodrop seatpost?!?! Let's go competition, this is what the people want!
  • 29 0
 I know, now someone just needs to come up with a 200mm version that lasts for months without needing to be recharged.

You can read more about it here:
  • 2 0
 That is cool!
  • 5 1
 I'll take the Fox Live Valve version for $1000, and of course, throw my $600 3D printed saddle on for good measure.

Jokes aside, an auto dropper sounds super interesting and slightly scary at the same time.. I'd be all over it for mellow XC trails though.
  • 9 2
 Yeah I bet this a real boon racing XC. You don’t want to tire yourself out doing extra squats to get that post down?
  • 10 1
 Agree, some of the electronics make me pause. But damn....that auto drop with springs and air charge...f'ing sweet and analog enough to have me interested.
  • 4 0
 @joedaho: lt is nice that you don’t have to lose pedal strokes cresting a hill just to sit down for a dropper. Look at euro xc a few more pedals and maybe nino doesn’t get the pass. This is pretty sweet.
  • 1 0
 @mikekazimer: YES,
I’ve been thinking about this since i first sat arse on a dropper post, admittedly, I was late to the party. For any riding style, this makes a tonne of sense to get the seat out f the way, especially undulating terrain, and unfamiliar trails!
Come on OneUp, or Fox, or BikeYoke, I need an 180mm version of this for my Sentinel!
  • 1 0
 Do you FullAuto, bro??
  • 9 4
 2.1 Barzos with 25-26 psi! Damn that’s hard and skinny for those conditions. Perhaps his strategy was to be skinny to cut through down to the hard dirt? I’d have lost on my tire choice alone. I’d have ridden Barzo 2.35- 19psi front and back
  • 9 0
 1.25 Bar = 18.1 psi.
  • 4 0
 yah in mud, you want skinny. Larger tires will pack up even more, carry more mud, rub against the chainstays, etc and become even more massively heavy.
  • 1 0
 2.35 Barzo's are the best XC tires out there, and they last forever.
  • 1 0
 @dmitri6: ... until you ride over a stone and the carcass rips to shreds Frown I loved mine until they fell to pieces.
  • 1 0
 @boybiskit: I ride with Barzo front and Mezcal rear, both in 2.35. They're awesome for XC duties. (The 2.25 that I also got and compared are almost the same size and somehow heavier)
  • 8 2
 SR suntour might make some cool stuff but their marketing is terrible and thus youll never hear about it. I think this very carbon laden fork is on closeout on the USA "website" they originally wanted four figures for it LOL
  • 3 0
 Duke are really making the best mtb rims! Super light and very vertically compliant. It's incredible how many racer and teams are using them officially like PFP or none officially like MVDP.
  • 2 0
 Curious what all the XC commenters, who said these “trail bike” geometries have no place in Worldcup XC racing, think about this result. From BMC: 67 HA and 75.5 SA (with this seat slammed forward). Well done BMC for bringing modern geometry to XC racing. Thanks for making XC bikes that I would actually want to ride.
  • 2 0
 Everyone's been moving that way for awhile. Scott Spark had a 68.5° headtube in 2016 when the Epic was still at 71°. Mondraker F-Podium, Scalpel, new Epic are all at 68° or lower. These bikes are all so much nicer to ride than the old XC geometry.
  • 2 0
 @nattyd: for sure. However, I’d argue BMC is currently at the cutting edge of progressive XC. But more to my point, every time a more progressive XC bike is reviewed or introduced, there are a handful of XC guys that jump on the forums and claim that these bikes won’t work for XC and you can’t climb with them. I think this win should shut down that argument.
  • 4 0
 What about Pauline winning everything this season on the canyon lux, 70 something HTA. A bike that pinkbike rubbished in their recent field test. Truly, the bike hardly matters. Machine is everything.
  • 2 0
 @Madfella: True, and plenty of people won on those 71° Epics as well. XC races are still mostly won on fitness. I've owned three generations of Epic with 71°, 69.5°, and 67.5° head tubes. They're all fast—the main difference is how sketched out you feel on steep, loose, or rough terrain.
  • 2 0
 @Madfella: I’d argue the races reflected PB’s conclusions pretty well. PFP was doing a lot more hike-a-bike through the technical climbs than the rest of the top 10, at least to my eyes, and the races where she had to do that more, it hurt her most (ie first WC). It’s not because she can’t handle a bike, she’s had some success in CX I hear
  • 2 0
 "Sarrou was on the gas from the start of the race and never looked back." Theres a lot of internal combustion envy going on in this article, even down to the name of the bike.
  • 6 0
 Go SR Suntour!
  • 2 1
 I saw one of these in person, and they are super slick. The dropper is fully integrated, looks like a regular seatpost. Don't usually drool over XC bikes, but these BMCs are dope.
  • 4 0
 Barzo? That's what I run. I could be WC....
  • 4 0
 I'm here to know more about that Suntour 34 fork and nothing Frown
  • 3 1
 You can't get it anywhere so why bother.
  • 5 0
 It's a great fork! I run that exact same combination of Axon 34 Werx fork and Edge rear shock on my race bike aswell. For the fork, our team did some back to back testing with the FOX 34 Factory Step Cast. Comparing the Axon with the 34, they are very much in the same league. The Axon is just as smooth and subtle on compression, but feels like its more solid and has less fore-aft flex. Damping and adjustability on the Axon is only about 90% as good as on the 34, but the 34 Factory Step Cast is also a lot more expensive and weighs ~200g more. In the end we chose the Axon over the 34 Factory Step Cast because it felt stiffer, is lighter and way better value for money.
  • 2 0
 @hubertje-ryu: You can though. Just order it through a bike shop.
  • 2 0
 He has a fixture for a saddle bag on his race bike. Should have raced with one, that would have been epic !
  • 1 0
 if you look at the second picture it seems like he actually does
  • 1 0
 @ESKato: Oh, you're right ! Hard to see on the phone.
I really like that guy. Wins with a saddlebag while others chase every single gram
  • 1 0
 All riders had this small sadlle bag looking thingy under their seats... I doubt it was an actual saddlebag with tools but idk what it actually was. Maybe something to do with timing or data recording. The usual small timing chips on the forks maybe don't work when covered in mud?
  • 1 0
 @Jango997: Indeed, didn't catch. Probably a GPS transmitter
  • 4 0
 @Jango997: It is a data acquisition device issued from the race organization- there is still a Tissot timing chip zip tied to the fork on race day but immediately removed by race organization when racers finish.

We have tested with the "saddle data bag" a few times like at the Rio Olympics (but not during the race).
You will see the same saddle bags on the Pro Tour road races now. It can give live data that you see on the TV screen like Moto GP or F1 for example, especially if the rider has a power meter on their bike and consent is given to use their data. The only real problem of the mtb is that UCI has it in a saddle bag which is not the best for use with many saddle rails and dropper posts especially.
  • 1 0
 @mattomoto: I'm pretty sure you're talking about Velon. Pretty nifty device.
  • 2 0
 cool rocketship and i imagine with 2.35 barzos it would be a cool trailbike too
  • 3 0
 That's a dream bike right there
  • 2 0
 The weight is post-race including the mud right?
  • 4 5
 "The tires were custom cut by his mechanic for optimal traction in the muck" so a pro mechanic can make a better tire than a tire manufacturer?
  • 7 1
 Probably siped the tires. Pretty common for any tire in any sport, nothing new. Mfg can’t make enough different tires for every condition. So you take what close and improve it.
  • 6 2
 You new to MTB racing? DH racers' mechanics do this regularly.
  • 3 1
 @LeDuke: they do it sure, I'm just skeptical about any possible gains other than weight savings.
  • 2 0
 how wide are his bars?
  • 1 0
 What saddle is that? Looks like something from Fabric.
  • 2 0
 It’s actually a Tioga saddle
  • 1 0
 Cheesy name for a mountain bike.
  • 2 5
 Looks like a Giant Anthem
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