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Video: Shredding the Gamux Gearbox DH Bike on Swiss Trails

Nov 11, 2021 at 2:11

We are not only designing our Bikes ourselves, we also go out and try to push them as hard as we can. True to the motto "we ride what we sell" we want to find confidence in your own designs. Join our head engineer as he sends the Sego down the trails on a mystical fall day.

"One more please!" - Closed lifts meant more hiking. But in true Gamux-fashion, the team got work done anyways, not shying away from a good challenge

Fall in the swiss alps - perfection! - The Sego was born in the Swiss Alps, providing epic landscapes and some of the best terrain to test a bike

Gamux Bikes Sego Pic by Sebastian Sternemann
Using swiss design and future-proof technology to provide bespoke riding characteristics, the Sego is built to go fast!

To find out more about the Sego, be sure to check our socials:
- Instagramm
- Facebook
- YouTube

Big thanks to our partners who support us in our pursuit of performance - you rock!
- Hayes Performance Systems
- Manitou
- Pinion

Video & Photos by Luka Geerts
Additional Photos by Sebastian Sternemann


  • 46 0
 Not a single pedal stroke. That gear box is flawless.
  • 13 0
 But he changed gear a dozen times !
  • 3 1
 Beat me too it. Even when he could have shifted a d pedalled, he speed tucked. Great advert for why a gearbox bike is not needed for Dh.
  • 13 1
 @betsie: you get better suspension performance without the derailleur, derailleur hanger, and cassette on the back though
  • 3 11
flag betsie (Nov 11, 2021 at 15:56) (Below Threshold)
 @wburnes: do you....
Engineers have made suspension work with the drive train fitted.
Plus... All that weight in 2 place on the bike!

If it was "better", it would be faster and all the top dh bikes would use it, as they don't, we can only conclude based on the evidence that a gearbox is "not better".

Came to that conclusion based on my limited knowledge of engineering. Engineering these days is 95% paper work, 5% engineering!
  • 5 0
 @betsie: I think it is only a matter of time before gearboxes become standard on all but the cheapest bicycles.

I think in the future all top dh bikes will use a gearbox system
  • 3 0
 In Alpen Bikepark Chur there's no need to pedal Smile
  • 5 2
 @betsie: ever thought about sponsorship obligations? How should a team that is sponsored by Shimano or Sram ride a gearbox bike? Also the bike brands have their requirements about other sponsors etc. If e.g. a team is sponsored by sram, their options are limited to frames of brands who sell a certain amount of bikes with sram drivetrains as stock.

Just from the technical side a gearbox for DH would be the way to go. But if marketing and contracts with other companies don't allow it, it won't happen.
  • 2 1
 @wburnes: me too. Surely DH and big gravity bikes are the bikes best suited to gearboxes.
  • 1 2
 @Phipu: I have a rough idea of how engineering and marketing works. Sponsorship, Whitley labelling, development cycle, testing and how to gauge performance.
As for it being the future, the very small minority have been saying that for so many years.
But more to folk think the earth is flat!

Someone from a WC team once said .. I test more than some WC teams do. True story.
  • 22 0
 Hey Gammux, why you no put a side-on pic of the bike in the article?
  • 4 0
 yes i came only here for that pic
  • 2 0
 Yess Zerode, But is nice a high pivot also. For the moment I ride a Spec enduro 2020, and I will change the bike when someone will bring to life a High Pivot, Belt drive , gearbox 29er enduro bike. I made the "mistake " to ride one day bikepark chainless, cassete -less , derailor-less. It was a game changer. Since then I am searching about belt drive, gearbox and high pivot. Cavalerie has a model but it has old geometry ( 66 HA)
  • 2 0
 Check out nicolai, not high pivot though
  • 3 0
 Starling cycles spur ticks almost all your boxes (it has a gearbox with a chain drive)
  • 1 0
 Will we ever see a vast majority of the WC DH boys and girls racing on gearbox driven bikes. Less chance of wrecking a der, smoother and reliable shifting for really muddy racing, considerable reduction in sprung weight for the rear wheel, drive train weight is low and central and less fuss in the bike pits between runs.
  • 1 0
 From my basic understanding ... the nagtive side of a gearbox is they can create extra friction taking away watts (power0 from the bike... but on an E-bike you've got a motor which can offset it. Would really like to see an gearbox E-bike.. it just seems to make sense.
  • 5 2
 I want a belt driven gearbox bike. The ultimate in silent, low maintenance shred rigs.
  • 7 1
 look at zerode from new zealand
  • 1 0
 @gentlebermslaps: Yah I have a buddy who’s got one. It’s super cool.
  • 18 0
 Us to, but the current UCI regulations would not allow us to race it with a belt Frown
  • 2 0
 I've got one, the Zerode Katipo. The only maintenance I've done all year is to clean and live the belt tensioner twice. The traction is just amazing, I've never felt more comfortable on a bike!
  • 2 0
 @GAMUXBIKES: Do you know the uci's reasoning behind not allowing belts? I'm just curious. It seems an odd thing to ban. Great looking bike, btw.
  • 5 0
 @kcy4130: Cause the UCI hates fun.
  • 1 0
 @gentlebermslaps: Nicolai had Belt drive way before Zerode
  • 1 0
 @GAMUXBIKES: does that mean Aaron Gwin should have been disqualified for his epic chainless run?
  • 3 1
 So, their advertisement for a gearbox bike includes no footage of them pedaling or using the gearbox. Interesting. Could have been a chain-less advertisement at this point.
  • 1 0
 Could have been chainless, instead it was pointless
  • 3 0
 Not a great display of the reasons why to get a gearbox.
  • 2 0
 Does anyone know the actual wattage lost to gearbox drag? 10W? 50W? Would be nice to have some perspective.
  • 1 0
 This is the best I could find: "90.5% efficient on average across 18 gears (Drivetrain loss of 19w @ 200w)"
  • 2 0
 @therealmancub: That seems pretty damn substantial. Bummer.
  • 3 0
 @lefthandohvhater: The 99% (or whatever) claimed efficiency of a chain drops off pretty fast when on the outer ends of the cassette when the chain line isn't straight. Same thing for a dirty chain.
From the reviews that were out in the gearbox golden age just before 1x drivetrains came out when it looked like they were the future the biggest complaint seemed to be inability to shift under load, not so much a drop in efficiency. Everyone is drooling over high pivot bikes with idlers rn but they have a loss in efficiency too.
Right now, I'd get a gearbox bike for a fun ride everyday bike. Just not for an XC race bike.
  • 2 0
 @Surestick: I think you can't compare the drag of pulley with the drag of a gear box ...
I had a Balfa BB7 and the difference with a Hammerschmidt or a Nexus was huge.
  • 1 0
 @Surestick: That is my feeling too, you would really expect the poor chain-line to hammer efficiency but the only study I could find of this doesn't seem to support it.
They instead seemed to find that it was "fine" in the lowest gears and only dropped off significantly in the smallest rear sprockets, however they had aligned the front sprocket with the centre of the cassette which isn't typical and can leave the chain rubbing the next biggest sprocket when in the higher gears.
Problem with the Pinions and similar is the constant engagement of all the gears, so there are inherently going to be losses associated with each mesh and there is a mesh for every gear plus the working mesh from the lay shaft back to the concentric sprocket.
  • 2 0
 Just a head's up, Gates Carbon Drive will be demoing Zerodes at Sedona MTB Festival this week.
  • 2 0
 Looks like a(n) …. ebike
  • 1 0
 hmm 10K CHF for a frame without shock and gearbox it seems. That pretty steep
  • 1 0
 I cant find their prices. Where does it say this?
  • 1 0
 Not related to the bike but does anybody know what kind of pants those are ?
  • 2 2
 Going by that video it may as well have footpegs instead of pedals. Still looks pretty cool
  • 1 0
 How much is the frame going to sell for?
  • 3 2
 I hope PB goo paid a fuk ton to post this
  • 1 0
 Whaat are them pants the rider is wearing?
  • 1 0
 You don't see enough slow-mo of some dudes arse on Pinkbike.

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