Campy "What is it"

[Plum Hill]

http://www.ebay.com/itm/NEW-Campagno...kAAOSwinVZsvq7

Could someone tell me what this is for?

[Black Dog]

Looks like the teeth that b tension screw moves to set the deraileure gap from upper pulley to the cassette.

[cadence90]

It is an indexed 29T ratchet, used to convert older (up to late 2009) Campagnolo 11-S rear derailleurs which have a 27T max capacity to a 29T max capacity, so that 12-29 cassettes can then be used. One swaps out the existing 27T ratchet and then substitutes the new 29T ratchet.

This video is pretty clear.

oldpotatoe can certainly explain it more clearly.
.
.

[kookmyers]

I am not sure of the vintage of my set but I am using a 12-29 and I really doubt this change had been made. Do I need to worry about it?

[cadence90]

Originally Posted by kookmyers

I am not sure of the vintage of my set but I am using a 12-29 and I really doubt this change had been made. Do I need to worry about it?

I am definitely no expert on the transition from 10-S to 11-S, etc., so I would recommend that you ask oldpotatoe that question specifically. If your rd is pre-2010, doesn't have the converter, and you have been running a 12-29 cassette since 2009 or even earlier with no issues...it seems that you are OK. If your rd is post-2010 it seems you are definitely OK.

Also, as you know, oldpotatoe is an amazing Campa-resource, and he frequently states (correctly) that the Campa-published restrictions re: cassettes/rds/fds are often very conservative, so he may even say that this converter is pretty superfluous.
.
.

[kookmyers]

I've been riding 12-29 for less than a year. The bike (which I bought used from here) came with 12-25. All I know is that it is white label SR11 on a bike from 2006. I also don't know if this was the original group on the bike. It may have been added later. Maybe I should try to see if I can read a part number.
I guess I am just trying to protect the longevity of the equipment by even considering this.

[cadence90]

If the rd is from 2006, (but, as you say it could be a later rd though) then you're right: it probably doesn't have the converter.
I would see what op says; if he thinks it is worth it, $7.50 is not very much for the correct piece.

[tuscanyswe]

if white label super record 11s (well any super record 11s actually since white was the first) rear derailleur your groupset is newer than your bike. The first sr group was realeased in 2008 if memory serves and had white logos. Believe the first red logos appeared 2010.

[oldpotatoe]

Originally Posted by kookmyers

I am not sure of the vintage of my set but I am using a 12-29 and I really doubt this change had been made. Do I need to worry about it?

The description of the part is correct and if you are already using a 12-29, no problem. Campagnolo did make this change but in reality, it wasn't really needed on bikes with properly fitted chains..it just had an additional hole in it for the spring end to make it a wee bit tighter.

11s. SR/Record/Chorus introduced 2009, btw.

[kookmyers]

Thanks everyone! I hope the OP also got the info they needed.

[Plum Hill]

Thanks.
I dug further last night while dancing with insomnia.
I'm always asked why I'm a fan of Campagnolo. Who else would come up with something like this to help users out. And spare parts, too.