Two Speeds, Two Chains

 Most of you, I suspect, ride or have ridden a bike with two chainrings.  I would imagine, however, that none of you have ridden a bicycle with two chains that isn’t a tandem.

Some folks are about to have that experience. They’re not Grand Tour riders or triathletes; none (as far as I know, anyway) plan on embarking upon a cross-country or round-the-world tour.

Rather, they are folks who use their bicycles as taxis, pickup trucks and cargo vans. I encountered such riders in Cambodia and Laos and even rode bicycles like the ones they use.  Those bikes, however, didn’t have the unique feature I mentioned at the beginning of this post.

So why, you ask, are some people about to ride a bike with two chains? And, where are they?

I’ll answer the second question first:  Africa.  I’ve never been there, but I imagine that parts of it are like the Southeast Asian countryside I saw:  unpaved roads and paths with few, if any bike shops.  And the shops that exist can’t order a part you need for your SRAM Red 13 speed shifter and have it delivered by Fed Ex the next day.

In such an environment, a bike that would need such a part would be all but useless.  And it would be worse than impractical for hauling a 15 liter metal jug of milk from farm to village.

World Bicycle Relief has been working to address people’s needs in rural Africa and other parts of the world.  It developed the Buffalo bicycle: a “tank” with wide tires, steel rims and a coaster brake. This was believed to be the bike with lowest possible maintenance. Also, because the bike has a coaster brake, it can be ridden with wheels that are significantly out-of true.  Oh, and it has a rear rack that can support up to 200 pounds.

As you can imagine, the bike is heavy. But its users didn’t mind:  Reliability is more important to them. That weight, however, combined with its coaster brake hub—which has only one gear—meant that most people couldn’t ride it up a hill, especially if it was loaded.

A new version of the Buffalo bike is designed to deal with that problem.  So why two chains?, you might ask.

Well, each chain runs on one of the two chainwheels—and one of the two sprockets on the rear.  Those sprockets are part of a freewheel that looks like a wider version of the ones found on BMX bikes. One chain wraps around the smaller sprocket and chainwheel while the other winds around the larger sprocket and chainring.

This arrangement results in a two-speed bike without a derailleur, internally-geared hub or coaster brake. So how does the bike “shift?”

Well, the freewheel contains a mechanism that disengages one gear while the other is being used. So, if you are pedaling in one gear, the chain still spins on the other.  And the “shift” is made by pedaling backwards, just as you would on a coaster brake.

Achieving that, of course, meant giving up that coaster brake.  Instead, a pair of dual pivot brakes binds on robust alloy rims to stop or slow down. As the developers explain, some strength may be sacrificed but, apparently, there’s still enough to support a 200 pound load in addition to the rider. And it’s also easier to true an alloy rim.

Oh, and everything on the bike—including the freewheel mechanism—can be fixed with a tool that looks like an oversized version of the old Raleigh spanner—or an adjustable wrench.

I, for one, would be interested to try such a bike, if for no other reason than to experience the two-speed, two-chain system.  And I am always happy when a practical bike—whatever that means for a particular place or kind of user—is designed.

In Motion On International Women's Day

Today is International Women's Day. 

As I've mentioned in other posts, early feminists saw the bicycle as a vehicle, if you will, of emancipation.  "Let me tell you what I think of bicycling," Susan B. Anthony intoned.  "I think it has done more to emancipate women than anything else in the world."  She explained, "It has given women a feeling of freedom and self-reliance."

She would especially appreciate the images of Women In Motion posted on World Bicycle Relief's site. 

World Bicycle Relief is, in its own words, "mobilizing people through the power of bicycles."  In doing so, according to the organization's website, "We envision a world where distance is no longer a barrier to education, healthcare and economic opportunity."

To that end, WBR manufactures its own bicycles under the "Buffalo" brand in Africa, and has them assembled by mechanics in the locales in which the bicycles are distributed.  WBR trains those mechanics, as well as others who are involved in the production and distribution of those bicycles.  Recently, their wholly owned subsidiary, Buffalo Bicycles Ltd., has begun to sell bikes to non-governmental organizations, corporations and individuals in need of affordable, sustainable transportation.

Universe (yes, that's her name) uses her bicycle to bring the vegetables she grows and the foods she bakes to a market where she sells them.

WBR has work-to-own and study-to-own programs for those who cannot purchase a bicycle outright.  As you might imagine, those programs benefit women and girls particularly because--especially in areas like rural Africa--they have little or no money and limited (or, again, no) access to the networks that would help them get credit to start businesses or other resources needed to get paid employment, go to school or simply to take better care of their families--or themselves.

Kesia is a health-care volunteer who works with victims of HIV, sexually-transmitted diseases and gender-based violence. Because of the long distances she must travel, she used to meet only four clients a day.  Now, with her bicycle, she can meet as many as 75.

That WBR manufactures, assembles and distributes locally--and trains people to do so, as well as mechanics--is also a major benefit to women, who often can't travel very far from their farms, villages or families to obtain an education or employment, let alone a bike.  It also, naturally, makes it easier for women and girls to obtain bicycles, which in turn gives them the mobility that affords them access to a greater range of educational, business and other opportunities.

Georgina, a 68-year-old widow, uses her bicycle to carry milk from her farm to a collection center 12 km away.

No less than Barron's financial magazine has lauded F.K. Day, WBR's founder and president, as one the most effective philanthropists.  While WBR doesn't bill itself as dedicated exclusively, or even primarily, to women and girls, it's hard not to notice the particular impact their programs have on women and girls, especially those in the most difficult circumstances.

I am sure that, were she alive today, Ms. Anthony would point to the organization and its programs as one of the prime examples of what she meant, especially what she said about self-reliance.