Monday, November 7, 2011

Jo Routens front derailleur project

Cable operated front derailleurs have been easily available since as early as 1930 and possibly before then. Why is it then that some of the more well respected French custom bikemakers of the fifties and sixties made their own? Rene Herse and Alex Singer both made
rod operated derailleurs and Jo Routens made a cable operated device.

Rene Herse front derailleur from the 1950s.

Simplex cable operated front derailleurs from the 1930s.>

I acquired a small, nicely constructed Routens frame some years ago but the Routens derailleur and its left hand down tube control lever had been sawn off by the previous owner, presumably so that a standard model could be fitted.
A customer was very interested in the frame but only if I could replicate the original derailleur and lever.
I managed to find photos of Routens bikes, some of which showed good images that I could use as patterns.

The original Jo Routens front derailleurs

The derailleur is pretty simple and my replica works really well.

The replica.

I set it up with TA 26/49T double chainrings and the chain makes the jump both up and down very smoothly.

However I cannot see that it works any better than a Simplex or Huret model that would have been available to Jo Routens when he built the bike. So why go to all the bother? Just to say “I can” I suppose.

I made a lever to accommodate the twin (loop) cable.

The derailleur and lever parts are off to the chromer now and the frame to Velocolour for painting. I will post images of the complete bike when it is finished,


OAP said...

Very nice. The custom cable or rod-operated French front derailleurs are fascinating. And there are many. On the Routens, it seems the screw on the top tube limits the outwards movement of the cage. How is the inner limit set?

Mike Barry said...

As you say the outer limit is set by a screw in the end of the upper sliding rod. I have the same screw on mine although it is not fitted in the photos.
The inner limit on mine is set by a sliding collar on the upper rod between the cage and the tube. This is not shown in the photos.
I have not been able to see any inner limit stop on any of the photos of Routens derailleurs.
It is possible to limit the throw by adjusting the cable.

Anonymous said...

I have heard the suggestion that the rod operated front derailleur will self-trim, assuming it is not a type with a spring.

Unknown said...
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James said...

Hi, very much like your blog.It is similar to my own bicycle blog, alhtough mine is not as technical as yours. I'm also a collector but at present with only 15 bikes.

I read the blog on your Bianchi Treader & wonder if I mgiht pick your brains regarding Biachis.Do you know if Bianchis were the only brand that used the three fixed single cable hoops on the top tube?
I ask as I have an old, possibly 1970s, Italian racer that I can't properly identify. The 3 cable hoops on the top tube are of the same style as used by Bianchi, as are the seat post bolt & the frame lugs. Anything else I can look at to make a positive ID. It's got Mavic rims.Unfortunately it's been ocnverted by a previous owner to a single speed so looking at gears is not an option. It has an Italian alloy handlebar & SR stamped into the bar stem.

Thanks in advance for any help you can offer.

James in Sweden

Mike Barry said...

Hi James,
There were many bikes with the three cable guides on the top tube.
If you send me some photos of the frame I may be able to identify it.

Mike Barry.

Michael H said...

I guess that even back then, builders were looking for a point of difference in their frames and components to distinguish themselves from the herd.
That could be why he designed his own front derailleur, when there were other very serviceable units available.
You repor looks great!