This Bike Is Insane… 18 Speed Gearbox Drivetrain With THREE Belts!

Рет қаралды 20,053

Күн бұрын

Пікірлер: 60

@buildfromsketch8102 4 ай бұрын

Co-motion being like: "So, let's see. How can we make this tandem unreasonably complicated while making the efficiency drop as much as possible...."

@sempi8159 4 ай бұрын

30% loss atleast

@LimitedWard 4 ай бұрын

Surely the efficiency loss is more than made up for by the second rider.

@sempi8159 4 ай бұрын

@@LimitedWard its so inefficient its like riding alone :)

@Cyclingabout 4 ай бұрын

@@buildfromsketch8102 Here’s a crazy fact. When my ex and I switched from individual touring bikes to a tandem, our average touring speed on the flat increased by 50%! Tandems are so quick that a few drive efficiency losses won’t matter that much. 💪🏻

@Cyclingabout 4 ай бұрын

@@sempi8159 My best estimate puts the drive efficiency of this tandem at 86.9% average across 18 gears (200W power output, 60RPM). It jumps up to 88.7% if you run the Pinion P1.18 with two belts instead of three. 👍

@randomdude5938 4 ай бұрын

Europe to Australia sounds like a very wet ride.

@michaelsmit486 4 ай бұрын

I'm just impressed you rode all the way from Europe to Australia on a bike.

@kevinnielsen1356 13 күн бұрын

My 20plus year old mtn bike has 27 gears, is lightweight, reliable, relatively inexpensive, highly efficient and simple.

@ProjectPhysX 4 ай бұрын

Wouldn't it be better if the tandem cranks don't have to be in sync, with additional freewheels? So either one can pedal and the other doesn't have to pedal at the same time?

@ericpmoss 4 ай бұрын

It's a good question -- people are not electric motors, and some have more slow twitch muscle or fast twitch, not to mention one rider being more tired. Saving a few percent mechanically but giving up many percent due to rider mismatch doesn't seem optimal.

@stevepaltzer7605 4 ай бұрын

Out-of-phase placement could have 4 possible orientations. Front, Right at 12, and then Rear, Right at 3 or 9. Front, Right at 12, and then Rear, Left at 3 or 9.

@liaminrio5463 4 ай бұрын

Seems like a lot of additional friction.

@exothermal.sprocket 4 ай бұрын

Yes, but I don't think tandem bikes are built to win any drag related competitions in general.

@LimitedWard 4 ай бұрын

If you want to see real friction, watch two people trying to ride a tandem for the first time!

@exothermal.sprocket 4 ай бұрын

I'd suggest maybe strong relationships are those who buy tandem bikes to begin with?

@harindergill7221 4 ай бұрын

😂@@LimitedWard

@mikaelljungberg1019 4 ай бұрын

Very intresting content thank you!

@vntcolder 4 ай бұрын

Tandem power !!! 🦵🦵

@matt.3.14 4 ай бұрын

I wonder why the stoker crankset doesn't drive the left side of the gearbox on the Comotion. Front and back would be spinning the same shaft, would be in sync, but you wouldn't be putting all the power through the belt from the front to gearbox.

@Cyclingabout 4 ай бұрын

You could definitely hook it up that way! I suspect there isn't the appropriate length belt available to make it happen.

@Daniel-rr8ih 4 ай бұрын

Expensive, but possibly cool solution: Two pinion gearboxes. One for each rider. The output sprockets would be linked. This way each rider can shift independently and pedal at their own cadence. Or would it be unstable to ride if you don't have synced cranks?

@KavanOBrien 4 ай бұрын

I wish Brompton would have a belt drive system, I think now they might be the only manufacturer that doesn’t have a belt drive in their range , we all know that belt drive systems are cleaner with no maintenance needed yet Brompton still living in the past.

@The1trueDave 4 ай бұрын

Just a theory: Bromptons (even SS/ IGH ones) need a chain tensioner to take up the slack created when folding, because the frame pivot is not concentric with the BB axle. I suspect belt drive tensioners might not be able to take up as much slack as chain drive ones which are derived from derailleurs, not because of any physical limitation but simply because they never had to. Maybe Brompton are designing their own tensioner in-house right now... or maybe they decided it wasn't worth the investment?

@Cyclingabout 4 ай бұрын

While Brompton don't make belt drive bikes, the aftermarket does! Kinetics UK build belt drive compatible Brompton rear triangles and special belt tensioners. Their system folds just like a chain drive Brompton!

@KavanOBrien 4 ай бұрын

@@Cyclingabout I know about Kinetics in Glasgow , it is more surprising that Brompton are so behind the future while other manufacturers are embracing it .

@KavanOBrien 4 ай бұрын

@@The1trueDave just check out Kinetics of Glasgow who already do belt drives on Brompton’s , you will also see there where Brompton got the idea of the new G - line from ,

@Cyclingabout 4 ай бұрын

@@KavanOBrien Brompton bikes have remained more or less unchanged for 40+ years until the G-Line came along. I would not be surprised if a belt drive version was in the works.

@EricPeelMusic 4 ай бұрын

Yeah, the non-drive side timing belt is more efficient too.

@larsborstlap3461 4 ай бұрын

I recomend looking at Hilite-bikes, In my oppinion they have the most beautiful tandems in the world. Swiss made titanium beauties.

@Boss-dr2zk 4 ай бұрын

You could also just take a Rohloff hub

@philherb3843 4 ай бұрын

Yes, because there is no suspension and no hub motor in the rear wheel, so this would be just the way.

@rapamune 4 ай бұрын

Could you review the all-to-bike gearbox ? Releases this year to my understanding. Gearboxes for the masses, not gated by OEM-only [or premium price] practices.

@tvuser9529 4 ай бұрын

Link? I can't find it.

@Cyclingabout 4 ай бұрын

Hopefully I can test an All-to gearbox when there is a production unit.

@MilchreismitZimt 4 ай бұрын

Boah, ihr seid Schuld dass ich mich für 2 Rene Herse Fleecer Ridge verschulden werde… und wehe die sind 💩 Nee, ihr habt mich überzeugt, und shokz werd ich mir auch noch holen. 😎

@jasontimmons1568 4 ай бұрын

I wonder if there is a way to run a Pinion gearbox with a DaVinci independent coasting system.

@d9918 4 ай бұрын

I think I'll just stick with a traditionally tandem.

@supremeflagship8965 4 ай бұрын

I would love to see a Pinion + Rohloff combo...

@brenster21 4 ай бұрын

A bike builder ages ago did Rohloff with an additionally speed hub on a Hurley Big Dummy, Surly Big Dummy Cargo Bike with Rohloff SPEEDHUB, Schlumpf Speed Drive which is the closest anyone has ever gone to build something like that. I would love to see a Pinion and Rohloff combo on a steel framed bike.

@Cyclingabout 4 ай бұрын

@@supremeflagship8965 Tout Terrain and Schindelhauer have both built these bikes (as April Fools jokes).

@danieldonaldson8634 4 ай бұрын

Pretty sure the 'j' in Campmajo would be sounded as and English 'h'. I mean, if you're going to promote the product, might as well get it right.

@Cyclingabout 4 ай бұрын

Thanks for the lesson but I called them regarding pronunciation... and there is a 'j' sound.

@shoaibmansoorkhan4790 2 күн бұрын

my planning mountain and jungle and desert , hot winter and cold winter , in travel , pakistan to italy , 30000 km long , alone , tell me about what is for me good bicycle

@bensmith4563 4 ай бұрын

I wish those gear boxes were alot cheaper it would be so much easier for my stupid brain to adapt that to what i want to do though knowing more about bikes would probably help alot

@Cyclingabout 4 ай бұрын

Internal gear hubs are quite affordable, and often just as good. Check out the Shimano Nexus and Alfine models.

@ellerybice3787 4 ай бұрын

🚴🏼🚴🏼🚴🏼🫡

@Paksusuoli95 4 ай бұрын

Not a very pretty solution :/

@music-of-india 4 ай бұрын

U r cycle psycho... Just like me... I have been trying to make gear box from old motorbike gears for my bicycle... But it is not easy..... Two years efforts are to vanish... It is almost done but take too much time and attention in my normal fabrication workshop... What to do...? Will be it easy to purchase any factory made gearbox from germany or etc...?