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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...? -
Thank you so much for so generous a response. Looks like I’ll stick to 11-29 then and try and find a second hand compact chainset then!
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Philbythesea
ghostface
@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.