Campagnolo cassette cog nomenclature

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swright
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Joined: Fri Mar 02, 2018 4:29 pm

by swright

Campagnolo appears to have two versions of many of their (11-speed) cogs and (three-cog) cog assemblies.

For example, the 15t cog in their 11-23t, 11-25t and all 12-2Xt cassettes is designated "15A", but the 15t cog in their 11-27t and 11-29t cassettes is designated "15D".

The same is true of some of their three-cog assemblies: their 11-25t cassettes uses a "21B-23B-25B", while their 12-25t cassette uses a "21A-23A-25A". And vice-versa as well: both the 11-29t and 12-29t use a "23B-26C-29C".

The preceding appears true whether a Chorus, Record or Super Record 11-speed cassette. (The titanium cogs used in Record and Super Record use the same designations, but the actual purchasable part numbers include a 'T' suffix denoting them as titanium.)

My question is: does anyone know what the significance is of the trailing A, B, C, D's after the cog teeth number?

Thanks,
Scott
2003 Klein Q Carbon Race (aluminum with carbon fiber seatstays) in purple haze, Campagnolo Record 11s groupset, Bora 50 Ultra (rim-brake clincher) wheelset, full Deda Elementi finishing kit, Fabric ALM Ultimate saddle [7.2kg/15.9lbs]

by Weenie


ParisCarbon
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Location: Winnipeg Canada

by ParisCarbon

From what I understand it has to do with the shift ramping to optimize it.

graeme_f_k
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by graeme_f_k

ParisCarbon wrote:
Sun Jun 17, 2018 1:50 am
From what I understand it has to do with the shift ramping to optimize it.
This is correct ... hence for best shifting, the need to use the correctly-resignated sprocket in the right place.

Other makers do this to varying degrees - in some cases they accept that shifting (especially under torque) won't be as clean or as quick and so offer the ability to build a cassette to user-spec (very much as we used to years ago with freewheels or early cassettes) or they don't offer loose sprockets at all, so wear and tear on a single sprocket can really only be dealt with by buying a full cassette.

It's also worth a note that the format of cassettes between the Potenza / Centaur cassettes and CH-RE-SR is different as in the former case, the fine differentials in sprocket spacing are handled in exactly where in the gauge of the sprocket material the teeth a machined (hence the fact that spacers of consistent thickness can be used and still maintain compatibility with CH-RE-SR derailleur systems) wheras in the latter the differences are handled in the spacers / carriers.
A Tech-Reps work is never done ...
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robertbb
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Location: Melbourne, Australia

by robertbb

Good topic.

While we're on it, is it possible to buy just the "23-26-29" all-in-one piece on its own? If so, any leads as to where and at what price? I want to swap out the 23-25-27.

The other sprockets are all the same with these two: 12-13-14-15-16-17-19-21.

Cheers!
It's ALL about the bike.

RobertBB's CyclePlanner Spreadsheet:
https://weightweenies.starbike.com/foru ... 8&t=152263

ParisCarbon
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Joined: Mon Feb 05, 2007 5:39 am
Location: Winnipeg Canada

by ParisCarbon

robertbb wrote:
Mon Jun 18, 2018 3:05 am
Good topic.

While we're on it, is it possible to buy just the "23-26-29" all-in-one piece on its own? If so, any leads as to where and at what price? I want to swap out the 23-25-27.

The other sprockets are all the same with these two: 12-13-14-15-16-17-19-21.

Cheers!
https://www.universalcycles.com/shoppin ... ategory=40

Scroll about 3/4 of the way down the page...

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swright
Posts: 41
Joined: Fri Mar 02, 2018 4:29 pm

by swright

robertbb wrote:
Mon Jun 18, 2018 3:05 am
Good topic.

While we're on it, is it possible to buy just the "23-26-29" all-in-one piece on its own? If so, any leads as to where and at what price? I want to swap out the 23-25-27.

The other sprockets are all the same with these two: 12-13-14-15-16-17-19-21.

Cheers!
robertbb,

The 23-26-29 cog assembly you are looking for is Campagnolo part number 11S-369 for Chorus (steel) or 11S-369T for Record/Super Record (titanium).

Scott
2003 Klein Q Carbon Race (aluminum with carbon fiber seatstays) in purple haze, Campagnolo Record 11s groupset, Bora 50 Ultra (rim-brake clincher) wheelset, full Deda Elementi finishing kit, Fabric ALM Ultimate saddle [7.2kg/15.9lbs]

by Weenie


robertbb
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Joined: Thu Jul 23, 2009 3:35 am
Location: Melbourne, Australia

by robertbb

Thanks heaps guys. Looks like part no. 11S-369 costs 75% of a new cassette :-/
It's ALL about the bike.

RobertBB's CyclePlanner Spreadsheet:
https://weightweenies.starbike.com/foru ... 8&t=152263

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