Tag Archives: Centurion Pro-Tour

1976 Bicycling! Magazine

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On this bitter cold snowy day in Portland, Oregon I took a nostalgia trip back to the 1970’s.  Long ago, I had a copy of this 1976 Bicycling! magazine edition but it had somehow gone missing.  I’ve been searching for another one since, and finally found a copy in good shape on eBay.  So, since cycling today (or tomorrow or the next day) is likely out of the question due to record snowfall and below freezing temperatures, it was fun to spend time perusing this mag’s fascinating pages.

The ads in vintage cycling magazines are actually as interesting (or more so) than the articles themselves.  Here’s Campagnolo making its case for the Super Record rear derailleur.  Catching my eye immediately was the “removable stop for easy disassembly” so that the derailleur can be properly serviced.  That’s a big contrast to today’s black box, unserviceable and throw away technology and one of the many reasons why I prefer vintage components.

Pricing is also interesting.  This Masi could be had for $699 from beloved Bikecology (whose mail order catalogs were legendary).  Likewise, framesets from well regarded builders were also on offer.  In today’s prices, the Masi would go for $3,675.

Here’s some book reviews up top, plus an ad for Barelli Supreme pedals.  I’ve got some of these pedals in my shop.  They are amazingly smooth, but I’m not likely to use them since I no longer ride with toe clips.

Here are some new products featured at the 1976 Cologne Bicycle Show.  Note the Shimano attempt at early indexing, as well as a strange saddle design from Sella Royal.

But the real reason I wanted this edition of Bicycling! magazine was the review of the 1976 Centurion Pro Tour – my touring bike for over 20 years.  The review sings its well deserved praise, with only a few nit picks.  I put over 40,000 miles on my model and the bike was a true friend.

Here’s my Pro Tour from an early 1980’s ride up in the San Juan Islands.

The magazine has an ad for the same front bag I used over those years, made by Eclipse.  It worked well, and I liked the simple frame which looped under the stem and supported the bag without the need for a front rack.  The map case, side pockets and easy front access were great features in the days before smart phones.  I normally stored my camera plus snacks and extra gloves up front.

Here’s a few more pages featuring ads from Mathauser (maker of oddball “finned” brake pads), Zeus, and even Chuck Harris’ mirror company (I featured Chuck in the previous blog post).

I’m looking forward to being able to get back out on the road, but it was fun to take a trip down memory lane today.  Vintage bicycles and components have a lot to offer and I’m glad to be able to share my enthusiasm.  Happy cycling!

Setting up Centerpull Brakes

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Center pull brakes are often standard equipment on vintage bicycles. Their design can allow more clearance for fenders and wide tires, and based on where the pivots reside, they may have more mechanical advantage than standard sidepull brake calipers.

But, centerpull brakes are sometimes viewed as more challenging to set up than side pull brake calipers.  How long should the straddle cable be?  How close should you set the brake pads to the rim? What is the ideal angle for the straddle cables?  How much torque should go on the mounting bolt?  What about lubrication of the pivot points and cables?  Should the straddle cable be thick or thin?  And, most important, how can you eliminate brake squeal on these often very noisy calipers.

Brazed on centerpulls – a 1978 Centurion Pro Tour

For over twenty years I cycled on a bike that had the best centerpulls you could find – brazed on centerpulls were standard equipment on my 1976 Centurion Pro Tour.  While this advantage went unnoticed by me in my youth (I had nothing to compare this to), I have definitely noted the extra care and adjustments needed to the bikes I currently ride which feature center pull brakes, but which are not brazed on to the frame.  The above photo shows brazed on Dia Compe centerpulls on a 1978 example of a Centurion Pro Tour.

1953 Follis branded Jeay brakes

1947 Peugeot with Jeay centerpull brakes

Brazed on centerpulls have been around for a long time.  The above examples show Jeay centerpulls on a 1947 Peugeot, and a more custom example from Follis on a 1953 frame.

If you are ordering a custom bicycle, you can most definitely specify for this braze-on feature.  Using the brazed on version of centerpull brakes keeps the brakes centered, and undoubtedly improves the overall performance of the brake.

What is the best way to set up centerpull brakes?  Sheldon Brown offers some guidance, as well as Park Tools.  But the instructions on these sites do not address some puzzling issues such as the proper length and angle for the straddle cable and the proper distance of the pads to the rim. Nor is the cable width and pivoting characteristics of the straddle cable discussed (a la Mafac).

For the question regarding the ideal pad distance to the rims, I can turn to both my own personal experience, as well as to one of my favorite resources – Glenn’s New Complete Bicycle Manual. The distance to set the pads to the rim is recommended at 1/8 inch, according to “Dr. Coles” (aka “Dr. Glenn” – the author whose white coat visage inspired my affectionate homage). That’s about 3 mm.  Seems about right to me, based on my many decades of cycling with centerpull brakes.

Rebour drawing of Mafac centerpulls with extra long straddle cable

The length and width of the straddle cable is another important element to consider when setting up these brakes.  For Dia Compe and other non-Mafac centerpulls, it may appear that you have no choice in selecting the straddle cable, but these cables actually come in all different lengths, not just the one included with whatever caliper you are working with.  The angle and width of the cables can impact the performance of the brakes.  More flexible and moveable cables (a la Mafac and Compass) will provide better performance. One of the nice features of Mafac brakes is that the straddle cable is actually a shifter cable cut short, so it is easy to replace and adjust these straddle cables for Mafac brakes, at will.

The above Daniel Rebour drawing shows a custom frame with unusual braze-ons for the rear centerpull calipers, resulting in a very long straddle cable.  In my experience, the length of the straddle cable is not so important as its angle – a wider angle at the yoke being more advantageous.  The angle will decrease as the brake lever is applied.  Also, pads should be set parallel to the rims, and with no upward or downward angle for best results (unlike some cantis which may need a slightly upward angle).

For Mafac enthusiasts, one issue is the flex characteristics of the fork and seatpost hangers.  These hangers are not very stiff, so that when braking pressure is applied, the hanger can flex significantly, reducing the performance of the brake and providing for a “mushy” feel.  Because of this, I have sometimes replaced the Mafac hangers with more robust hangers on my bikes with centerpull brakes, and with good results.  The above photos show the Mafac hangers.

V-O brake pad holders with toe in adjustment.

V-O smooth post pads – non squeal variety.

Brake pads are important to any brake set-up. While Kool Stop does make Mafac replacement pads – both in orange and black compounds, I have found that I prefer using Velo-Orange pads for my centerpull brakes.  They are quieter and yet perform equally well.  I usually lubricate all the pivot points on any centerpull brake I am setting up, as well as lubricating the straddle cable and yoke.  It’s critical to check your cables and the bolts securing them for wear and proper torque on a routine basis, and if any cables show degradation, replace them immediately.  You never want to apply the front brake, only to have it fail. That’s 70% of your stopping power.

Why I Love Cycling

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1974 Touring Bicycle with fillet brazed joints – Photo credit – DeLong’s Guide to Bicycles & Bicycling.

In 1974 I was a high school senior, soon to graduate. I often rode to classes on my 5 speed derailleur bicycle, and that involved a number of steep hills, some of which I dismounted to ascend.  The bike I rode seemed incredibly incompetent, heavy, and badly geared.  At that time, I knew nothing about lightweight steel tubing, expertly brazed and filed lugs, and quality components.  I was riding the bike my parents purchased for me, after much goading on my part.  I can’t even remember if my 5 speed was a Sears or a Schwinn, but I think it was the former.  All I knew then was that I loved to ride bicycles, and wanted to be on my bike whenever possible.  My parents did their best to accommodate this odd request coming from their middle child – a daughter no less.

Baby blue Volkscycle

Upon graduation, my parents presented me with a beautiful blue Volkscycle. I was in heaven, as this was the nicest bike I had ever ridden.  After riding this bike in my college days in the late 70’s, I took a hiatus from school, and moved to the Oregon coast.  That was when my cycling energy surged. Every Sunday I mounted my blue Volkscycle and rode inland up Yaquina Bay, to Toledo, and back.  I rode this bicycle whenever I could, leaving my funky Datsun 510 truck in the carport most of the time.

After a while, I began to realize that the Volkscycle might not be the best bicycle out there for me. There was no internet at this time, so my knowledge came word of mouth talking to other cyclists, some of whom were part of the 1976 BikeCentennial.

Later, I acquired my 1976 Centurion Pro-Tour – a bike which really defined my cycling experience.  The frame was “too big” for me, and yet I toured all over the Pacific Northwest on this amazing bicycle.  I crashed it back in 1999, and that is what prompted a life long search for an equal partner.

But that never happened.  Instead, I ride on several bicycles regularly.  I have never found my one true love – the bicycle of my youth which comported me over miles of challenging terrain.  I don’t know what to think about why that is – but the upside is that I now enjoy riding a number of wonderful and interesting machines.