I've got two, a Gipiemme-badged one on an Allegro, and a Motobecane-badged one on a Team Champion. I believe they are horizonal parallelograms, like a Shimano Crane, not slant parallelogram, like a SunTour. The difference is that the face plates on a horizonal parallelogram still lie in a plane parallel to the freewheel cogs, while those on a slant parallelogram lie in a plane oblique to the cogs, which is the secret to maintaining a more nearly constant distance between jockey wheels and freewheel. Both my 6600's shift quite well IMHO, particularly as they are paired with Simplex Retrofriction shifters. On the other hand, I also think the Simplex 5500 shifts well, much better than a Campy NR in my opinion. I have no experience with long-cage versions of either model.
Regards,
Jerry Moos
Houston, TX
> I'm very familiar (experienced) with the regular parallelogram(sp?)
Simplex
> SLJ 5500 but have never used the Simplex SLJ 6600 slant parallelogram rear
> derailleur. Anyone on the list have experience with both items and care
to
> discuss your comparison of them in use? Also, did both come in short and
> long cage versions; and with the advantage of being able to handle a
greater
> amount of chain, does the long cage have any negative affect on how well
> they work?
>
> Thanks in advance,
>
> Eric Elman
> thinking about going radical with a slant parallelogram derailleur
> Somers, CT