I wanted a go-to-coffee bike with a little more interest to it and also to broaden my horizons on how some older bikes work. So I picked up this Singer Grand Sport French city bike. No, not an Alex Singer and neither any connection to the British Singer bicycles.
Singer Grand Sport.jpg
Even though the paint and finishes could really use restoration my plan is to just clean it up and replace only those items needed to get to proper functionality. There is a lot of bare frame exposed but fortunately where I live rust progresses very slowly. None of any of the components so far have any dates to help zero in on the age of this bicycle. Any help in this regard would be much appreciated.
I have some comments and questions I could use some help with over time if anyone has some input.
First, on the rear derailleur, which I believe is a Simplex Route Leger, I think the sheet metal hook aligned with the idler pulley is used to hook to the extension spring to hold the derailleur arm up during a wheel change, is this correct? In this picture the hook is just under the nut at the lower pulley.
Secondly, the pulleys on this derailleur have some scalloping where they mate with the chain rather than teeth like a modern derailleur or smooth like some older ones. Were the pulleys manufactured this way or is this wear? You can see the scalloping in the picture above.
I also wonder why the idler pulley cage has a fork attachment to the derailleur arm. Is this for easy removal of the chain so the whole derailleur does not need to be removed when the chain is pulled? The disconnected cage is shown in this picture.
Any help to these questions or general observations of the bike are much appreciated,