Bike Forums - View Single Post - Anybody seen one of these before?

07-27-09 | 07:27 AM

#12

mkeller234

Rustbelt Rider

Joined: Oct 2008

Posts: 9,105

Likes: 388

From: Canton, OH

Bikes: 1990 Trek 1420 - 1978 Raleigh Professional - 1973 Schwinn Collegiate - 1974 Schwinn Suburban

Porta catena was a failed Campagnolo system. It bolted on the inside of the driveside drop out and occupied a cog space. It was supposed to be for fast tire changes, you use the shift lever to move the chain off the freewheel and onto the porta catena to disengage the freewheel.

My 1978 Raleigh has the porta catena holes, so I am guessing your frame was built around then. I don't know how long these dropouts appeared though.

This Pogliaghi has a Porta catena installed, the RD is also marked 1978:

See the extra piece on the shift lever:

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Last edited by mkeller234; 07-27-09 at 07:36 AM.

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