D
Dave Mayer
Guest
Someone just gave me a bizzarre late-80's Campagnolo rear derailleur. With a little research, I've
figured out that it is a Chorus A-B unit. It is light and looks very well made. I stripped it apart
and put it back together; I found that it has the unique feature that you can adjust the slant of
the rear parallelogram. Set in the A position, the slant of the cage matches a close ratio
freewheel, and in the B position, the slant of the cage tracks a bigger ratio freewheel. It has no
spring in the upper pivot...
I've checked the geometry of the derailleur. The cage is identical to modern Campy units. Set in the
B position, the parallelogram slant is the same as modern Campy road units. The only difference is
the where the cable terminator sits relative to the derailleur cage. I can compensate for this
difference by mounting the cable on the top (opposite) side of the mounting bolt.
Once this is done, the overall geometry of the derailleur should be the same as a modern Campy unit,
and it should index with Ergopower shifters. Right?
Here is my question - which I cannot find a satisfactory answer on the web: Will this actually work?
I have a modern Athena unit sitting in a box. Should I waste my time fiddling with the Chorus unit?
Thanks in advance...
figured out that it is a Chorus A-B unit. It is light and looks very well made. I stripped it apart
and put it back together; I found that it has the unique feature that you can adjust the slant of
the rear parallelogram. Set in the A position, the slant of the cage matches a close ratio
freewheel, and in the B position, the slant of the cage tracks a bigger ratio freewheel. It has no
spring in the upper pivot...
I've checked the geometry of the derailleur. The cage is identical to modern Campy units. Set in the
B position, the parallelogram slant is the same as modern Campy road units. The only difference is
the where the cable terminator sits relative to the derailleur cage. I can compensate for this
difference by mounting the cable on the top (opposite) side of the mounting bolt.
Once this is done, the overall geometry of the derailleur should be the same as a modern Campy unit,
and it should index with Ergopower shifters. Right?
Here is my question - which I cannot find a satisfactory answer on the web: Will this actually work?
I have a modern Athena unit sitting in a box. Should I waste my time fiddling with the Chorus unit?
Thanks in advance...