Campy Rear Derailleurs

On 8/11/2018 10:49 PM, wrote:
On Saturday, August 11, 2018 at 9:30:57 PM UTC-5, Frank Krygowski wrote:
On 8/11/2018 7:01 PM, wrote:
On Saturday, August 11, 2018 at 4:29:38 PM UTC-5, wrote:
I expect that Muzi knows the answer to this one:

Is there any mechanical advantage difference between a 10 speed and 11 speed
Campy rear derailleur?

"mechanical advantage difference"? Meaning what exactly? Does one shift better, faster, more precisely than the other?

I'm betting Tom is asking about the distance the derailleur moves
laterally for a given amount of cable pull.

But we'll see.

If that is the case, then the 11 speed shifter moves the rear derailleur less distance laterally than the 10 speed shifter. And the 10 moves less laterally than the 9. And the 9 moves laterally less than the 8. And the 8 moves laterally less than the 7. I think 130mm rear road spacing came into existence with 7 speed. Or was it 8? In any case, with more and more cogs on the same 130mm rear hub width, and assuming the freewheel body is the same length, then you need less and less space for each cog as you get more and more cogs.


Yep, all correct, Mr Seaton.
Suntour promulgated a 128mm Seven while Shimano had the 130
format. Shimano prevailed. A big leap was Campagnolo's
innovation to hang the low gear sprocket off the back of the
cassette body by stamping a pie tin shaped sprocket.

We're clearly into diminishing returns for changes on 130mm
now. Even Shimano has competing road and MTB cassette body
formats for 11 cassettes.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971