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Video: Greek BMXer George Ntavoutian Rides World's Largest Full Vertical Bike Loop

Apr 25, 2024 at 11:16
by Sarah Moore  


Greek BMX rider George Ntavoutian has made history after completing the largest full loop in world biking history. He and his team found a disused pipe in the Greek city of Trikala that measured 7.5 metres high (24.6ft) for the attempt.

bigquotesWords can’t describe how I feel right now!! It’s a dream coming true and I’m so proud of my self for not giving up to my goals!! I knew I could walk away from this monster since day one!! Can’t thank enough everyone who believed in me and supported me through this journey and especially Red Bull for making this possible. No matter what’s the next project this one will always be the most special project in my life, since day one everyone worked so hard to set everything up so I could go there and give my best!! There were moments that I just stood still and watched everyone working so passionately for something that was “mine” but what makes this project so special was that it was everyone’s project, every person in there had the same same vision as I had… I knew there was no chance I would let these people down!! I kept thinking about the celebration we would have after this.. and it worked just like I thought!! The tears, the screams, hugs… It was our project and our celebration!! I just made history and I can’t realize it, after the adrenaline rush faded I went outside and saw my helmet, Pat Casey’s name and started crying like a baby, I did this for him and for everyone who loves and supports me. I hope you enjoy this video as much as we did!!George Ntavoutian

On the first morning of his attempt, the production team set up a ramp that proved too small for the bike's speed - resulting in a steep take-off that forced him to quickly tuck in his body and injure his waist. After rising from the airbag, he said he was in quite a bit of pain and his expectations were pretty low. On the second day, his team created a larger ramp and Ntavoutian was able to complete the loop.




Matt Macduff mastered the 20 foot loop at his compound in Nova Scotia, but his attempt at on the 40 foot Loop of Doom he built in South Africa in 2016 was unsuccessful.

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Author Info:
sarahmoore avatar

Member since Mar 30, 2011
1,472 articles

61 Comments
  • 129 3
 Forsure he’s got a BMX background
  • 38 0
 One might even say foreground.
  • 13 0
 @number44: he's definitely into sports stuff.
  • 1 0
 Alaina's big brother !
  • 61 2
 So we're bringing back Photo of the Year for that last shot to win it, yeah?
  • 3 1
 God yeah, that's fantastic
  • 9 0
 I think it's fair to say that it'll be doing the rounds.
  • 3 0
 They should bring back Friday fails...
  • 2 0
 @CSP: yessss
  • 24 0
 Amazing. Congratulations that’s bonkers.
  • 14 1
 That is insane.... He didn't even do it in a controlled environment.... Just some random pipe.
  • 2 0
 One of his insta videos shows him doing a lot of attempts and landing on an airbag. But yea, talk about urban!
  • 13 0
 That drone died in awe.
  • 2 0
 That’s good
  • 6 0
 Absolutely terrifying. He jumps off a house to flat concrete on that one try where he bails at the apex. Learning how to crash is the deal with these BMXers. I feel for his mother. That said what an amazing athlete, hats off.
  • 1 0
 I think that's the key with skating and BMX, knowing how to fall and roll out. If you ever watched the skating gap The Lion, the skater does multiple takes, and rolls off each take with (what appears) minimal scrapes, just keeps going.
  • 9 0
 the shortest must watch in history
  • 3 1
 Are you sure? It feels like at least five minutes he's almost falling from the top and then somehow doesn't.
  • 8 0
 @AndrewHornor: not so sure, considering how many times I watch it Smile
  • 9 0
 Pure Sonic 3 vibes.
  • 6 0
 Not many of us are brave enough to drop into a half-pipe, let alone a full-pipe.
  • 4 0
 I've now got OPM's Heaven is a Halfpipe going through my head Smile
  • 5 0
 What a nutter! The outtakes on RB are brutal.
  • 5 0
 These BMX dudes must be cut from a different cloth, because I can't imagine walking away from that one where he basically fell off the ceiling--let alone trying again!
  • 4 0
 Simply amazing!! Μπράβο σε όλους! Ελλαδάρα παντού!!
  • 5 0
 MacDuff Round 2...FIGHT!!!
  • 1 0
 Ngl, I thought this was one of those random , unknown but highly skilled casual riders until I saw the Redbull helmet. Not possible without the full resources of Redbull involved ie. airbag.
  • 2 0
 Less then 10y ago he almost became young world tour road rider. So goood that he decide to go back to BMX!!!
  • 3 0
 How fast did he have to go ?
  • 4 0
 18.193m/s at bottom dead centre when neglecting air and rolling resistance.
  • 10 0
 I gave it a try and came to pretty different results. Again, neglecting rolling and air resistance, but taking into account that the rider's center of mass doesn't travel directly on the 7.5m loop. Here's how it goes :

Normal force at the top of the loop is zero. Centripetal force is related to the diameter of the loop, potential energy is related to the variation in height of the center of mass of the rider, thus:
E_i=E_f

F_g=N+F_c at the top of the loop.
Minimum speed is found when N = 0 at the top
mg= 0+m (v_f^2)/R where R = D_loop/2

v_f=√(g×D_loop/2)
R is the radius of the loop, v_f the speed at the top of the loop.
1/2 mv_i^2=〖1/2 m[√(g×D_loop/2)]^2+mg∆h_cm

∆h_cm is the difference in elevation of the rider’s center of mass between the bottom and top of the loop, about 5.5 m in this case, since the rider’s center of mass if approximately 1m above the ground (7.5 - (2X1)) :

v_i=√(g(D_loop/2+2∆h_cm ) )

v_i=√(9.81(7.5/2+2(5.5)) )


v_i≅12.03 m/s≅43.3 km/h≅26.9 mph (Bare minimum speed at the bottom of the loop in ideal conditions)
  • 5 0
 @patricknoel: Too bad you weren’t consulted when they built the first ramp.
  • 4 0
 I did not concider the riders higher centre of mass. Otherwise I used the same approach. The lower effective radius will of cause reduce the required speed from my first calculation.

v=sqrt[(5.5m/2)*g]+sqrt(5.5m*g)=12.537m/s

Does anyone know a bmx riders moment of inertia? Wink
  • 4 0
 @patricknoel: If you're ever at the pipe where this happened, I'll gladly buy you the rattle can to paint this on the wall.
  • 3 0
 Pretty, pretty, pretttttttty good.
  • 2 0
 Amazing! How the fuck is possible to do it after that terrifying crash! Congrats dude.
  • 1 0
 Totally mad hatter level! Doing a 24-ish foot concrete loop is tapped enough.. coming in off a booster at speed to wall ride to tunnel loop that size…. King !!
  • 3 0
 That is unreal.
  • 1 0
 Drone operator is not going to let themself relax after missing that shit. I would be so bummed
  • 2 0
 that is absolutely nuts
  • 1 0
 Well, that's pretty awesome
  • 1 0
 That’s a scary maneuver! Respect.
  • 2 0
 Holy smokes
  • 1 1
 This beyond epic. The technicality of this line shouldn't be underestimated.
  • 1 0
 I've already watched this 10 times... before my 2nd cup of coffee.
  • 1 0
 The first attempt without the airbag though... Holy effing shhhhh...
  • 1 0
 Shot**!
  • 1 0
 R.A.D!
  • 1 0
 Badass
  • 1 0
 EEEEEETSI!!!!!
  • 3 4
 This should be measured in circumference. Just saying. 23.56m loop.
  • 9 0
 The distance traveled is not what's intrinsically interesting; it's how high off the ground he was riding on the ceiling. Anyway he rode a helical path so the circumference of the circular cross-section isn't even the distance he traveled.
  • 6 0
 @barp: very valid. But what if people want to start riding ovals.
  • 7 0
 @JamesPBlaw: Then I'm gonna have to learn yet another formula. You just got me to learn that you compute the length of a helical path with the Pythagorean theorem, by imagining you cut the cylinder into a sheet, then calculating the length of the hypotenuse of the right triangle formed between the unrolled circumference and the distance traveled down the tube, and finally multiplying that hypotenuse by the number of loops in the helix.
  • 5 0
 @barp: how high off the ground? Considering he did this in a buried pipe, he was, paradoxically as it may sound, closer to the ground at the top of the loop than at the bottom.
  • 1 0
 3.14159265358979323846264338327950288419716939937510
  • 2 0
 @mi-bike: Duuude you just blew my mind!
  • 2 2
 It's all Greek to me
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