C.N.C Special Randonneur. Some lovely details on this, such as the seat stay caps. Owners words below.
Cycles C.N.C. is a fairly obscure French brand that hand made exquisite custom bicycles for over fifty years, starting in the 1930’s. This particular example is one of their finest, with an all-Reynolds 531 frame and crisp lug work.

C.N.C. began life in 1936 as The Societe Fletcher-Ducret, owned by Raymond Fletcher. It was a small shop in Paris located at 112 Boulevard de la Chapelle. They had a small retail trade, but made most of its money making special frames for many French professional riders. Most of these custom bicycles were re-badged with the make of the company that sponsored the riders’ teams. Fletcher also supplied the top riders of quite a few of the eastern-bloc countries in the 50s through to the 70s, including Russia and Poland.

No one seems to have any idea of what the abbreviation stands for. It is believed that the Special-CNC frames were the very top of the range, possibly custom frames, hand-brazed by one of the top three builders employed by the company. One of these builders was Rene Andre, a noted “constructeur” and contemporary of Rene Herse who also built bespoke bicycles under his own name.

It’s made of Reynolds 531 tubing, with carefully thinned and filed lugs. The logos are all hand-painted, adding to the sense that this was a carefully built custom machine.

I kept it nearly original – just swapped out the bars, stem, saddle, brake hoods, and replaced the cables & housing. It came with a lame townie bar setup and Kalloy stem that was obviously added later, so I gave it a nice Belleri stem and G.B. randonneur bars. I switched the Ideale saddle for a Brooks Pro of the same vintage to match the new black leather tape. It came with a set of white Bluemels fenders that I kept on it. There are tire savers mounted inside the fenders, a very cool little detail. The wheels are Maillard 700 hubs laced to MAVIC tubulars, and a 5-speed Maillard “corncob” freewheel.

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1960s Jo Routens 650B full chrome, pic heavy. Owners words below.

In autumn of 2014, I acquired one of my “grail bikes,” a Jo Routens randonneur. After it arrived from France, I rode it around the city for a few months. Then in the summer, I took the plunge on a full restoration, with the goal of bringing it to the 2015 Eroica event.

It was quite an undertaking, and definitely the most expensive and technically complex restoration I have ever embarked on. The results were spectacular! I began by having the frame, fork, stem, and front derailleur re-chromed. These were all hand made by Jo Routens, just for this bike.

As I waited for the frame to be ready, I scoured eBay and other sources for parts. I replaced the original MAFAC Racer brake set with a “new old stock” set and assembled a brand new long-cage Simplex SX610 rear derailleur by mating the cage from a SX 410 GT with the body of a SX 610.

I tracked down a new Ideale 2000 saddle and JPR seat post, which had to be specially cut short to accommodate the rear brake cable, that runs through the center of the seat tube.

New Grand Bois tyres and GB bar tape. Brake pads by Kool-Stop finished off the build.

Assembling this beast was the hardest part. Normally I can assemble a restored bike in about 4-6 hours of work, depending on how tricky the components are to work with. This bike took me a week of work, about 4-5 hours every night for five stressful nights.

There were two main challenges: first, because so much of this bike was hand made to Jo Routens’ precise specifications, there was no room for changing chain ring sizes, or number of cogs on the freewheel, or even the tooth count of the cogs. The bottom bracket was also handmade by Routens, and used press-fit sealed bearings that I had to track down.

As I lacked a proper bottom-bracket press, re-installing it involved blocks of wood, a hammer, and nearly a heart attack on my part (WTF🫣 Guiness)

The second challenge was that the chroming threw off the tolerances – the chromed stem no longer fit into the steerer tube, the brakes didn’t fit over the bosses, and every threaded hole had to be chased with a tap before bolts would fit back into them. On the stem and bosses, I had to gently sand down the chrome until the parts were the correct diameter again.

The hardest part, which took two days to figure out, was re-assembling the hand made front derailleur. It used a Cyclo “twin-cable” mechanism, which instead of relying on a spring to provide counter-force, moves strictly based on which direction the cable is turned in.

I took several photos prior to dismantling it, but I soon realized that I could not use the original shift wire because it was now too short.

Cyclo shift wires are a continuous loop, fashioned by connecting both ends of a single wire together with a tiny brass block and an even tinier grub screw. The block then fits into the shift lever.

The shift wire must be exactly the right length, or the lever’s positioning will be off; it should sit at the 10 o’clock position, in line with the down tube, when the front derailleur is in the smallest ring. When it’s in the largest, the shifter should be at 1 o’clock as shown in the picture at left.

Making this even harder was the fact that the connector block and grub screw were worn and stripped. After the shift wire twice snapped apart at the block when under tension (shifting chain rings on a hill), I plundered a new old stock Cyclo rear derailleur kit to get a better connector block.

Eroica was one of the most fun bike-related events I have ever done, but the ride portion was also one of the toughest. The route included many steep grades and rocky, unpaved roads in wine country, testing the full range of gears on the Routens. Late in the day, there were some trails that I even had to dismount and push the bike up – it seemed like more of a mountain bike ride than one aimed at vintage road bikes.

Unlike the photos shown, at the time it was equipped with the original T.A. cranks and chain rings, which were out of true. Shifting across the chain rings was difficult, as the wear on the front derailleur can attest to.

After Eroica, I replaced the crank set with a Sun XCD, which is a high-quality reproduction of the original T.A. Specialities cranks. The outer ring is Velo Orange, and is made with integral ramps and pins that help engage the chain and drastically improved the shifting up front.

After Eroica, I rode the Routens occasionally, but ultimately it became more wall art than daily rider. As much as I love vintage bikes, I’ve gotten to a point where I have had to admit to myself that I prefer smoothness of modern shifting and larger cassettes, and the comfort of large brake hoods to rest my hands on. I have retrofit a number of vintage frames to use modern group sets, but on the Routens it would be sacrilege.

It was purchased recently by a collector, and thus brings to a close my romance with one of the rarest marques among vintage bicycles. Simply getting to examine the details of the frame and the components opened my eyes to the beauty, and idiosyncrasies, of the great constructeur Jo Routens.

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