The chain fell off the outer chainring on the 1998 Porsche Bike S front derailleur during a ride last week. It was a nasty mess with the chain all contorted. Fixing the chain, I continued on my ride. From that point, the front derailleur seemed out of alignment causing the chain to slightly rub on the front derailleur cage in certain gears. The rubbing was a slight inconsistent mechanical grinding sound. I thought maybe the chain-off incident caused the front derailleur to go out of alignment. But after many attempts, I couldn't get it back into alignment.
Poking around I noticed the derailleur cage could pivot out away from the derailleur mechanism from one corner. It shouldn't do that! Then I noticed the pin that holds the cage to the derailleur frame mount had backed out slightly. Lightly tapping the pin back in through the frame mount, the derailleur cage snapped back into place.
The images below show the derailleur cage and pin.
NOTE: This specific pin mechanism system is only on the 1998 Porsche Bike S with the Sachs Plasma derailleur. The Sachs Neos derailleur mechanism on the pre-1998 Porsche Bike S is completely different.
Front derailleur cage should swivel out evenly and securely. If the right (front) side swivel's out more than the back, the pin has backed out.
I tapped the head of the pin completely back in with a screwdriver and mallet, see image above.
The image above shows the pin through the derailleur frame mount, as it should be positioned.
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