Chain jammed between middle and granny rings
I bought an old tandem some weeks ago. It's a circa-1980 Gitane tandem. We rode around 500km on it, and even if it's far from perfect (it's a bit wobbly), we really enjoy it.
However, there seems to be a problem with the front derailleur. It's a (non indexed) Simplex. Sometimes (it happened 4-5 times for the moment) when shifting from the middle ring to the granny ring, the chain is jammed between the two chainrings. It happens when I forgot to shift BEFORE an hill, when the cadence is probably too low to shift without any problem.
I think I need to be more careful: I should shift when the cadence is fast enough. However, I also wonder if that problem could come from a worn derailleur (especially the spring).
Some information :
- Chainrings are : 53/42/34
- 5 sprockets freewheel
- Chain size : 1/2 x 3/32
- Drive train setup : crossover front drive (drive chain from the front crankset to the rear wheel, timing chain from the front crankset to the rear crankset)
- The drive chain is quite long, and I'll replace it ASAP since I think it's worn
Here is the Simplex derailleur :
What's your opinion ?