Originally Posted by
old's'cool
So I have a Swiss CILO bike from the mid-late 70s that is currently sporting a Campagnolo Nuovo Record RD. The bike came to me with a Shimano Arabesque 600 RD, and the NR swapped right on no problem, so I assume the built in hanger is bog standard, whatever that is.
Question, will a Simplex SX100 type RD like this swap on with no issues, or will there be issues?
...minus the separate hanger, of course!
First off
NO... Because the claw mount Simplex derailleurs like the one pictured above were not made to be used on a direct mount dropout hanger or even be easily converted.
While some 1960's early 70's Simplex Prestige and Criterium derailleurs came setup to be used either direct mount or with a claw hanger, after the mid 70's Lucien Juy the founder of Simplex, in his infinite wisdom, couldn't see fit to make one
SIMPLE derailleur that could be used either way!
The claw mount derailleurs used a different top pivot bolt than the direct mount models.
A claw mount could be converted to direct mount if you could find the correct upper pivot bolt, travel stop plate and mounting screw. There were
a lot of variations in the pivot bolts and travel stop plates so finding
the correct ones for a 35-40 year old derailleur is like looking for hen's teeth!
Additionally, those Simplex derailleurs with the Delrin plastic knuckles on the parallelogram are always suspect because they're way past their "sell by date". Delrin breaks down when exposed to certain chemicals found in lubricants and also UV light from the sun.
Next question? What would you like to achieve by switching derailleurs? What's the tooth range on your freewheel and how many teeth on your chainrings?
Shimano 600EX Arabesque derailleurs were rated at 28T max sprocket with 26T chain wrap. You can probably go larger with some experimenting.
I was on one C&V ride where 3
THREE people were running 34T freewheels with Campy NR derailleurs!!! NRs can handle up to 30T FWs on many bikes without any problem!
If you are looking for a long arm large capacity RD, I'd suggest finding one with a dropped parallelogram, they shift much better. All of the major derailleur manufacturers made them, even Campy! (Suntour, Shimano, Simplex, Campy, etc.)
Read my posts in this thread - the definitive guide to Simplex SLJ derailleurs...
http://www.bikeforums.net/classic-vi...-capacity.html
verktyg
Chas.