Originally Posted by
dddd
Those actuation-ratio numbers quoted on the CTC site aren't anything more than reference approximations.
1.4, 1.6, whatever, these are not numbers intended for use in calculations, and, as such, will not produce very accurate results.
OK: here are some very precise derailleur mechanical advantage values:
- Campy pre-2001: 1.43:1
- Campy post-2001 1.50:1
- Shimano MTB and road: 1.67:1
- Shimano old Dura-Ace: 1.83:1
- Sachs New Success (early 90's): same as old Campy. Contrary to a bunch of misinformation on the web, these derailleurs and shifters are functionally equivalent to old Campagnolo
Here are numbers that I am trying to track down:
- Latest Campy 11 speed: ? Advantage is greater than the 10-speed versions? ... I need this number.
- Shimano Dyna-Sys ?
- SRAM ESP: No, it is not 1:1, but more like 0.8 to 1. I need an accurate measurement.
- SRAM road: ???
Wisdom comes in knowing the numbers.