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Old 12-22-20, 08:44 AM
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denaffen
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Join Date: Dec 2020
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Bikes: Bianchi Nyala, Bianchi Campione D'Italia, Luxus folding bike, Nishiki Sport, Bianchi Torino, KHS Aero Sport, probably something else around here somewhere

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My understanding is that the most failure-prone part of those old Simplex derailleurs is the pulley wheels, which have a habit of self-destructing. If that happens to you (or you're worried about it happening) Suntour pulleys can be used with the original Simplex bolts. That said, for my own Peugeot it was easier to just drop a Shimano in.

Oh ... and if you do want to replace it, you'll need a new hanger, too. The original one uses a different bolt size than Shimano or Suntour.
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