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I would like to get Campy with a compact with an 11-27 or 11-28 sprocket set. Can the new Campy 11 speed sprockets be modified? Say take a 12-27 and make it an 11-27? Or a 11-25 to an 11-27? Without reduced function?
 

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Try it out. I've done this with 10 speed veloce cassettes and built a 12-29 and 12-26. You might have to overshift a bit, make sure your spacers are right (they get confusing between the blue ones etc.

FWIW, Campy 11s compact and a 12-27 should work in all conditions save the 50mph downhills. If that is the problem, skip the compact.
 
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vitdoc said:
I would like to get Campy with a compact with an 11-27 or 11-28 sprocket set. Can the new Campy 11 speed sprockets be modified? Say take a 12-27 and make it an 11-27? Or a 11-25 to an 11-27? Without reduced function?

It could be done, not necessarily without reduced function. When you look at one of the cassettes you can see how they were machined to enhance shifting performance, mixing and matching throws this off a little bit and is usually noticeable at the gear where you make the change.

It also used to be a little easier to do as many/most of the gears were single gears as Centaur and Veloce are today. The way the gears are grouped together on the 11 speed cassettes it seems less than optimal.

You could take the first part of an 11-25 and the end of a 12-27 to make:

11 12 13 14 15 (17 19 21)( 23 25 27) gears in () are grouped together on a carrier

I haven't had my second cup of coffee yet but it looks like any other method would result in trading the 21 for a 16 and leave you with a jump from 19 to 23.
 

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thoughts...

Your suggestion is the only way this could work, since there are two groups of three that can't be altered.

I tried a similar change once to make a 12-29 10 speed, but the 15-17 shift really sucked.
 
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