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I had posted this in the "Any questions answered..." but it's similar to Ghostface's question above, so might be more appropriate here...
I have a Chorus 11sp groupset (carbon style, I think it's the 2014-2018 version).
Compact chainset (52/36), 11-25 cassette.
According to specs, short cage has a 34T capacity, and max cog size of 29T.
I'd like a bigger ratio for bigger hills.
I can buy a new Centaur (11sp) medium cage RD with 37T capacity and 32T max cog size, and a 12-32 Centaur 11sp cassette, which would be ideal, but I'm not sure if this will be compatible with the older Chorus shifters ?
Any help/advice greatly appreciated.Having read your post, I've checked the little white stickers:
RD: RD11-CH1
FD: FD11-CH2B
Chainset: FC13-CH062C
Shifters: EP11-CH1C...which means it's pre-2015, finally.
Which I guess means it's even less likely that my shifters and RD will work with a new Centaur 11sp medium RD and 11-32 cassette...?
Philbythesea-
Correct, means your groupset is MY2011. Please note that Campag was selling and producing this code up until 2014. So items sold up until 2014 would still have the 2011 code as no changes were made to that product since. Your crankset is MY2013 as this was the year Campag introduced the 52-36 ratio IIRC.
It's also the key reference to use when looking for the correct spare part i.e.
The Centaur 11s parts are not compatible with any other 11s parts, with the exception of the cassettes and chain as long as the cassette is within the outer limits of the rear mech in question.
Quote from the manual of the Centaur rear mech;
"The Centaur rear derailleur is designed to function exclusively (and is therefore com-patible) with Ergopower Power-Shift commands marked with the letter D"
The letter D is visible when you lift the rubber hood, it's not part of the code that's mentioned on the white label.
Rule of thumb:
2011-2014 11s drivetrains, Chorus / Record and Super Record ergo's, chainsets and mechs will happily mix and match. Athena 11s is based on a different shifting system (single click downshifts vs multiple in Chorus and up), and will therefore behave differently. Also the Athena chainsets are based on Power Torque vs Ultra Torque for the high-end.
Anything from 2015 onwards for 11s Chorus / Record and Super Record, is not compatible with anything pre-2015 other than the chains and cassettes. Once again, always keeping in mind the outer limits of the mech. I do believe the chainsets will work with each other as well although you might need to re-adjust the front mech a bit.
Potenza 11s, here you have the version pre and post DB, items suiteable for DB use will show the HO mark.
Ergopowers with EP17 code will only work with FC17 chainsets (power torque) and RD17 rear mechs. EP18 ergopowers codes will only work with FC18 chainsets (ultra torque) and RD18 rear mechs.
In general, all 11s chains and cassettes can be mixed and matched, just make sure you remain within the outer limits of the rear mech.
Current 12s drivetrains can be mixed and matched without issues.
MementoMori
You can check either the rear mech / chainset i.e. it should show a small white sticker with a code. On the rear mech this should start with RDxx-SRxxxx. The two digits that come after RD indicate the modelyear.
The same goes for the chainset. This code should start with FCxx-SRxxx. Or "CH" in case of Chorus.
The 29T is indicated for a reason. If you run a less than ideal chainline / length, shift under load etc etc it's likely for the rear mech to snap and come off due to your simply exceeding its outerlimits.
Reason I'm curious to understand the modelyear, is that it might be safer considering changing to a 52-36 up front i.e. instead of exceeding the outer limits of the mech. From the moment Campag moved to the 4 arm crank design, the BCD became similar for all chainring combinations.
Meaning you can easily swap between fixed combinations of chainrings.
Anything based on the 5-arm design had a dedicated BCD for 53-39 / 52-39 and a different one for the 50-34 and 52-36.
If your groupset is from 2015 onwards, you could look for the medium cage rear mech although in this day and age they might be hard to come by.
It used to be available in Chorus / Record and Super Record when they were still in range components. The Chorus RD (medium cage) is now available to order as a spare part under RD15-11CH2SP. This will only work with 11s drivetrains from 2015 onwards.