Mercier rear derailleur

[funk2monk]

Unfortunately the original Simplex gears have failed and need replacing.
The frame has the fixing/location hole but this is not threaded?
Existing gears bolted through but I can’t find a replacement set.
Do I put a hanger on and go for the conventional threaded mount?
Open to suggestions.
Cheers

 

[Sharky]

Can you take a photo of what you have now?

 

[funk2monk]

Can you take a photo of what you have now?

Here’s the main body of the Simplex and mounting hole in frame

 

[Cycleops]

Doesn’t seem to any alternative but to use one of those C hanger mounts.

 

[Sharky]

Good photos, but I don't know what to suggest. The brazed on hanger looks a bit different to "modern" hangers and I'm not sure if a modern RD, even if it was threaded or bolted on would fit your hanger and if the stops would be in the right place.

If you go for a bolt on hanger that goes round the axle, the existing brazed on might be in the way.

Do you have any old parts you could experiment with? I have a bolt on hanger you can have to experiment with. PM me your address and I'll post it to you.

Another option would be to forget the gears and switch to single speed or fixed. The horizontal drop outs are perfect for single speeds.

Good luck

 

[Cycleops]

Having a look at the back of one of my Shimano derailleurs I see there’s a C clip that secures the fixing bolt, remove this and it may be possible to replace it with the nut and bolt from your Simplex.

 

[funk2monk]

Good photos, but I don't know what to suggest. The brazed on hanger looks a bit different to "modern" hangers and I'm not sure if a modern RD, even if it was threaded or bolted on would fit your hanger and if the stops would be in the right place.

If you go for a bolt on hanger that goes round the axle, the existing brazed on might be in the way.

Do you have any old parts you could experiment with? I have a bolt on hanger you can have to experiment with. PM me your address and I'll post it to you.

Another option would be to forget the gears and switch to single speed or fixed. The horizontal drop outs are perfect for single speeds.

Good luck

Good photos, but I don't know what to suggest. The brazed on hanger looks a bit different to "modern" hangers and I'm not sure if a modern RD, even if it was threaded or bolted on would fit your hanger and if the stops would be in the right place.

If you go for a bolt on hanger that goes round the axle, the existing brazed on might be in the way.

Do you have any old parts you could experiment with? I have a bolt on hanger you can have to experiment with. PM me your address and I'll post it to you.

Another option would be to forget the gears and switch to single speed or fixed. The horizontal drop outs are perfect for single speeds.

Good luck

Thank you Sharky,
I know it’s a weird one.
I may look at a line for like replacement Simplex but first will look at ‘modern’ hangers to see if this will work.

 

[funk2monk]

Thank you for all the answers and suggestions. I’ve been experimenting and now realise I have no idea how you are meant to fit the gears to the frame and keep tension. Do you fix from behind using the retaining nut? Or do you screw to Allen bolt in? Either way it seems to lock the gears to the frame with no movement or the tension spring is unable to keep the gears tight!!😲