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Home»Opinion»It’s an Engineering Marvel: Discover Why This 23kg Bicycle Has Two Chains
Opinion By Miles CooperJanuary 19, 2025

It’s an Engineering Marvel: Discover Why This 23kg Bicycle Has Two Chains

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Jackton Achola runs a bread supply provider in Kenya. He gathers the loaves, puts them into vibrant pallets, and stacks them prime, above his head, at the pannier of his Buffalo motorcycle. He then secures the burden down with two rubber cables, and pedals out throughout his group in Kisumu.

On one go back and forth, Achola can distribute sufficient meals for round 480 folks. “I’ve done it for so many years,” he says. Not too long ago, one thing has modified.

Achola is certainly one of 8 testers in his nation who’ve been trialling Global Bicycle Reduction’s (WBR) newest Buffalo type, provided with its new AK2 device – a drivetrain with two chains. It’s a progressive thought, one who took two years to increase, and has been patented with the assistance of US portions producer SRAM.

The speculation, WBR’s Michael Kelly explains, got here after feedback from testers like Achola, who have been the use of the former singlespeed Buffalo motorcycle. “One of the pieces of feedback was the desire to add a gear to the bike when you’re riding under a heavy load,” Kelly explains. “That was sort of the dream behind it.”

The double-chain drivetrain is located at the Software S2 Buffalo motorcycle, the newest type of WBR’s flagship product. Since its release in July, it has passed through 1000’s of miles of trying out, and received design awards at motorcycle displays. Now, it’s being rolled out into communities.

World Bicycle Relief's Buffalo Utility S2 bike

Jackton Achola has been trying out Buffalo motorcycles for greater than a decade.

(Symbol credit score: Global Bicycle Reduction)

“The philosophy of the Buffalo is that you have components that are going to survive the challenges,” Kelly explains. The place WBR operates in Sub-Saharan Africa and South The us, such stumbling blocks come with tough terrain, excessive warmth, and the want to undergo heavy shipment, incessantly exceeding 100kg.

“You can’t have external derailleurs that are going to get gunked up or damaged, and then not have the ability to service those when you’re in these remote environments,” Kelly continues. “The traditional derailleur systems and other mechanisms just aren’t lasting, right?”

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The speculation for the two-chain device got here from an engineer at SRAM, an organization established through the founders of WBR. “These are the guys innovating for riders on the Tour de France,” says Kelly. They’re additionally innovating for riders like Achola.

So how does the two-chain device paintings? “Essentially,” Kelly begins, “you have these two different chain rings that are at different tensions. What we were able to do was engineer a mechanism that allows you to, through a backpedal shifting motion, cause the freewheel to shift from one chain tension to the other.

“We were able to add this extra gear without adding any complicated external derailleur or wiring.”

The motorcycle is made on the Large manufacturing unit in Taiwan, and shipped to WBR’s seven programme international locations: Zimbabwe, Uganda, Kenya, Zambia, Malawi, Tanzania and Colombia. The price of one motorcycle, from the extraction of its fabrics to supply with its proprietor, is round £145 ($180). Even though they may be able to be bought, the ones at the programme obtain them without cost.

“It’s about building a bicycle ecosystem in the communities where we operate,” says Kelly. “We have something like 3,500 mechanics that we’ve trained in our program countries, as well as over 100 Buffalo bike retail shops.”

The brand new two-chain device, Kelly says, is “simple enough” that any educated mechanic can restore it. “It was really sort of an engineering feat to figure out,” he provides. “The feedback so far from our test riders and the people that are getting access to this bike is that they love the extra gear.”

World Bicycle Relief's Buffalo Utility S2 bike

(Symbol credit score: Global Bicycle Reduction)

It’s no wonder, too, {that a} 2d equipment has been so welcome. The motorcycle itself, constructed for sturdiness slightly than efficiency, weighs 23kg – greater than thrice the UCI minimal weight prohibit. The body is constituted of metal, the edges from aluminium, and there’s a kickstand for simple loading and unloading.

Within the communities WBR serves, the brand new type has been a “game changer”, Kelly emphasies. “It’s a tried and tested, robust workhorse that’s been designed to work in these environments.” Having surpassed 850,000 motorcycles allotted, the non-profit organisation is now excitedly homing in at the a million milestone.

What this implies is that extra folks, college scholars and industry homeowners like Achola can commute thru their communities sooner. Due to the two-chain device, their trips have now gotten more straightforward. “I really would like this bicycle to improve the whole world,” Achola says. And it’s, one swift backtrack at a time.

23kg bicycle bicycle design chains engineering Engineering marvel feat lightweight bicycle two chains
Miles Cooper
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