Showing posts with label tandems. Show all posts
Showing posts with label tandems. Show all posts

20 October 2014

"The First Brakes That Worked"

If you have a Peugeot--or almost any other French bike (Motobecane being one of the notable exceptions) made before the late 1970's, you are riding them.

No, I'm not referring to those plastic Simplex derailleurs or the longer-lasting but worse-shifting Huret models.  Unless you acquired a bike that was never ridden, you've probably had to replace your shifters by now.  Even If you didn't need to, you might have.




On the other hand, there's a good chance you're still riding your Mafac "Racer" brakes.  You might have replaced the pads and cables--actually, you should have because even if the bike wasn't ridden, the cables were probably corroded and the pads hardened.  If you did, and your brakes are adjusted, they work as well as--or even better than--most brakes available today.

I am mentioning them because, for about two decades, they achieved a distinction very few other bike parts held:  They were used on bikes at all price and quality levels, from the machines ridden by Tour de France winners to the most utilitarian city and town bikes.  Some time in the mid-1970's, Mafac came out with the "Competition", which was really the same brake with a shorter reach.  Later, it was cleaned up and polished (and still later offered with gold anodizing).  A longer version of the Competition --i.e., one with the same reach as the Racer--was also marketed.

 

The one other difference between the "Racer" and "Competition" was the straddle cable:  The one on the Competition had double ball ends, while the Racer used what was essentially a shorter link of derailleur cable (with the barrel-shaped end used on Campagnolo and Simplex shifters) bolted into hex-shaped ends.

While some may see these brakes as anachronisms, they have an important place in cycling history. Some cycling historians say they were "the first brakes that actually worked".  That is almost not hyperbole:  There seemed to be a mentality among brake-makers (at least those that made brakes for road bikes) that was expressed by a Campagnolo representative at a training session:  The purpose of the brake is not to stop, but to decelerate.  Some would argue that notion gave the brakes of the time too much credit.

(When I first got serious about cycling, there was a joke that the Universal 68 side-pull--commonly supplied on bikes that were otherwise all-Campagnolo--was a "courtesy" brake.)

One reason for Mafac's superior power was the way the brake block attached to the arm:  through an eyebolt.  This allowed a far greater range of adjustability along the vertical and horizontal planes.  This was particularly important with rims like the Constrictor Asp, which did not have flat parallel sides.

(The Asp seems almost like an embryonic version of today's V-shaped "aero" rims!)

Another advantage offered by the "Racer" brakes was that the length of the straddle cable could be adjusted to optimize the mechanical advantage of the brake.  This allowed the brakes to work well with a variety of different levers, as well as with the pads set all the way up or all the way down--or anywhere in between--on the brake arm.

Now, you might be thinking that the first working center pull--and the one on which others were based, at least in part--is not so important because sidepulls have advanced so much, and so Mafac has been relegated to la poubelle de l'histoireWell, even though Mafac hasn't been in business for about three decades, their place in cycling history is sure because of the very first product they made, about seven years before the "Racer" was introduced.



Their cantilever brake, introduced in 1946, remained in production throughout the company's history (about four decades).  It's not the first of its type.  But, compared to the ones that had been made before, it was easy to set up and use, and was more powerful.  For as long as Mafac made them, nearly every lightweight tandem was equipped with them.  So were many high-quality bikes made for fully-loaded touring, and most cyclo-cross racers.  For the latter, cyclists often brazed the necessary posts to old racing frames to accommodate the cantilevers which, in addition to offering superior stopping power, were not as easily clogged by the mud that is an essential element of any cyclo-cross race.

The early mountain bikes also used Mafac cantis.  When Dia-Compe and Shimano made  cantilever brakes that appeared on off-the-shelf touring bikes (and second-generation mountain bikes) sold in the US, their designs were basically adaptations and refinements of Mafac's.  Weinmann also more-or-less copied Mafac cantis and, apparently, bought Mafac's tooling and continued making cantis, in steel as well as alloy, until their own demise in the 1990's.

Many of us still use cantis today.  Those of you who use V-brakes also have to thank Mafac, because Vees were developed from cantis.  And even those of us who use dual-pivot sidepulls owe a debt of gratitude to Manufacture Auvergnoise de Freins et Accessories pour Cycle for developing the centerpull that helped to make it possible!

For me, it's interesting to recall that Frank Chrinko, the proprietor of Highland Park (NJ) Cyclery when I was working there, would not ride any brakes but Mafac centerpulls.  In fact, he put a set of Competitions, along with a mixture of Campagnolo and top-shelf French and Japanese parts, on a frame that was built custom for him. 


05 November 2013

November Discs

Those of us who are writers or other creative artists have our own ways of getting started.  One obvious way for a writer is, of course, reading.  But many of us also follow visual cues such--or, as you might expect, take walks or bike rides.

When I first started writing poetry, I would sometimes begin my work with word associations.  For example, if I looked at the sky, I might write that word, then "flight", "wind", "skip", "bliss" or other words, and write a couple of lines using those words.

These days, I sometimes play a version of that game, if you will, on Google or some other search engine.  I might type in a word or phrase and see what comes up.

I did that a moment ago.  I typed in "bicycle november" and came up with a bunch of things, including a shop called November Bicycles.

Of course, I checked them out.  They're very much a racing-oriented shop, so I may not ever buy anything from them.  However, I like its owners' philosophy--or, at least, what I gleaned of it from the blog that's part of their site.

For one thing, they feel that racing bikes--and, especially wheels--cost too much.  So, as they explain, they market their own products and bypass many of the distribution channels through which other retailers obtain the merchandise they sell.

And they clearly have their own opinions about riding and equipment.  At least those opinions seem to be based on experience and common sense--and, unlike at least one other would be philosopher-bicycle retailer, they're  not evangelizing or selling a lifestyle.

Mike and Dave of November Bicycles

One blog post I found particularly interesting was "My Opinion On Disc Brakes."  In it, the author admits that he uses discs on at least one of his bikes.  But he also doesn't relish the prospect of them becoming the de facto industry standard for all bikes.  For one thing, trying to squeeze them into a road bike, which has narrower frame spacing than a mountain or cyclo-cross bike, can be problematic, especially if the bike has an 11-cog rear cassette.  The only way it seems possible to make it work is to use a brake with a smaller rotor, which negates most of the advantage a disc is supposed to have over caliper brakes.

About that advantage, he's skeptical, if not doubtful.  He also mentions problems in keeping them adjusted:  On some models, on some bikes,it's all but impossible to keep the pads mounted close enough to the rotor so that braking response is quick and powerful, without the pad occasionally rubbing on the rotor as you ride.  So you choose between response, power and modulation or being able to ride at more than a snail's pace.

What I found interesting is that the arguments he makes against disc brakes--except for the difficulty of using them with 11 (or even 10) cogs are ones I and any number of other mechanics could have made thirty years ago.

As I mentioned in an earlier post, "new" ideas in bike design (or almost any other area, for that matter) almost always are reiterations of things that had been done before.  For example, German manufacturer Altenberger made dual-pivot sidepull caliper brakes during the 1960's and '70's.  A few bikes were equipped with them; as one mechanic lamented, "They have the worst features of center pulls and side pulls, and none of the good features."  About twenty years ago, Shimano resurrected the dual-pivot concept and eliminated most of the problems encountered on the Altenbergers.

So it was with disc brakes.  As I recall, a Japanese company, a French company and Phil Wood made them.  For the latter, it was probably the only faulty product he ever made:  They were recalled.  But they, and the others, had the same problems with adjustability and issues with rotor size the author of November Bicycles mentions.  


Back in my day, the only bicycles that used discs were tandems.  Because tandeming has always been one of the smaller niches of the bicycling world, ideas, innovations and products developed for them rarely find their way onto other kinds of bikes.  That, and the problems I mentioned, are the reasons why disc brakes all but disappeared by the mid-1980's.