11 speed 11-34 cassette on Campagnolo

Discuss light weight issues concerning road bikes & parts.
Yoln
Posts: 17
Joined: Thu Nov 14, 2019 10:26 pm

by Yoln

Hi

I have found a 10 speed 11-34 casette on IRD website and the more recent 12 speeed Chorus version, but I am struggling to find that compatible with a 11 speed campy setup.

I just tried a 53*39 with 11*34 setup on a friend's bike (Shimano) and found it absolutely perfect for me and would like to repeat that on my campy setup.

joejack951
Posts: 714
Joined: Fri Feb 18, 2005 6:50 pm
Location: Wilmington, DE

by joejack951

Could you live with an 11-32? 11-34 11 speed simply doesn’t exist as far as I can tell.

If you must have 11-34, consider swapping your freehub for a Shimano/SRAM version to gain access to that cassette. Spacing is close enough to get decent shifting according to some on the internet. I have never tried it myself, though. I have firsthand measured Campy and Shimano 11 speed cassettes and there are ‘measurable’ differences there. I just have no idea how they affect indexing in the real world.

by Weenie


Yoln
Posts: 17
Joined: Thu Nov 14, 2019 10:26 pm

by Yoln

Thanks,

I am fine mixing chainring, chain and dérailleurs brands, but due to the spacing reasons you mentioned I've never been comfortable mixing rear derailleur and cassettes brands...

I was also thinking about making my own cassette swapping dentures 29 and 34 (from a 12 speed 11-34 cassette) with the 28 and 32 on a 11-32 11 speed cassette, making it a 11-12-13-14-15-17-19-22-25-29-34 (instead of 28-32). Would that work?

alcatraz
Posts: 2416
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

Swap to a semicompact crank maybe? Or try a shimano cassette.

Frankie13
Posts: 455
Joined: Thu Jan 27, 2011 9:52 pm
Location: USA

by Frankie13

Shimano 11s cassette will work perfectly with campy. I rode it for many years and didn't even had to adjust the derailleur when swapping between rear wheels with campy or Shimano cassette. Shifting was spot on and drivetrain was silent.

DaveS
Posts: 2715
Joined: Fri Mar 24, 2006 1:26 pm

by DaveS

Shimano 11-34 11 speed cassette has nasty 2T jumps where a Campy 12-32 has 1T jumps. If you can handle that, swap to a shimano compatible hub and cassette.

Campy's 11-34 12 speed is straight block up to the 17.

Catagory6
Posts: 418
Joined: Thu Feb 09, 2017 2:36 am

by Catagory6

an 11-34 cassette will probably need a medium-cage rear derailleur.
the upper jockey wheel needs to cover a greater distance for 11-34, than 11-26. so the parallelogram needs to be a different dimension
a small cage might work? especially if you're going to use a shimano 11s cassette, because they have a narrower pitch (distance between the center of each adjacent sprocket), i don't know?

check out the cassette charts here:
https://en.wikibooks.org/wiki/Bicycles/ ... Dimensions

the pitch difference between an 11s shimano, and campagnolo is 0.11mm. that adds up over the course of 10 clicks of the lever

that being said, i am running Pre-2015 campy 11s rear brake/shift lever, with a campy 10s medium cage RD, and a shimano 11s 11-34 cassette, a KMC 11s chain, with a wolftooth road link (which you will probably also need for the upper jockey wheel to clear the 34t sprocket), and everything shifts brilliantly

joejack951
Posts: 714
Joined: Fri Feb 18, 2005 6:50 pm
Location: Wilmington, DE

by joejack951

Campy 11 sprockets are not consistent in thickness nor do they use the same thickness spacer throughout the cassette. While well meaning, that website is incorrect.

Yoln
Posts: 17
Joined: Thu Nov 14, 2019 10:26 pm

by Yoln

Thanks a lot to you all for the thorough answers.

@alcatraz, I still like my 53 with 11-12-13 during crits, would keep the standard crank if possible.

A Shimano 11-34 with a wolftooth road link seems like an easy working solution. I'll probably end up with that.

Though, I might still want to try to build my own cassette, starting from a 11-32 campy 11 speed, and swapping the last 3 rings with a 25-29-34 that Campagnolo sells as a replacement for their 12 speed Chorus cassette. Making it a 11-12-13-14-15-17-19-22-25-29-34.

Any thoughts on why it'd be a bad idea? That would solve DaveS and joejack951 issue of 1T/2T jumps and non consistent spacing of Campy cassettes right?

DaveS
Posts: 2715
Joined: Fri Mar 24, 2006 1:26 pm

by DaveS

Your proposed 11-34 would not work, since the 25-29-34 combination has 12 speed spacing. Either live with an 11-32 centaur cassette, or forget the idea.

kkotsiouros
Posts: 6
Joined: Sun Aug 04, 2019 5:45 pm

by kkotsiouros

I think that it will work. The whole cassette will be shorter about 1mm. So you will need 1mm spacer (I found mavic spacer for campagnolo 0,55). It will work with gx eagle 12 speed narrow chain (5.25). It is interesting project.

DaveS
Posts: 2715
Joined: Fri Mar 24, 2006 1:26 pm

by DaveS

The RD movement won't match the 12 speed cog spacing on the largest 3 cogs. That can't work great.

bm0p700f
in the industry
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Location: Glermsford, Suffolk U.K
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by bm0p700f

If you dont like 2t jumps then your ideal cassette is an 11-21T.

kkotsiouros
Posts: 6
Joined: Sun Aug 04, 2019 5:45 pm

by kkotsiouros

DaveS wrote:
Sun Nov 17, 2019 7:05 pm
The RD movement won't match the 12 speed cog spacing on the largest 3 cogs. That can't work great.
The significant difference will be on the last 2 cogs.

Before 1st cog of the last triplette (25 cog) it will be campagnolo 10 speed 2.42mm spacer (no 11 speed 2.25 one).

So the 25 cog will be 0.1mm farther apart (taking into consideration different cogs thikness)

The 29 cog will be 0.27mm closer
The 34 cog will be 0.64mm closer

Campagnolo 12 speed cogs pitch = 3.48 , cogs thickness=1.45
Campagnolo 11 speed cogs pitch = 3.85 , cog thickness=1.6

Is 0.64mm for the last cog so significant?

DaveS
Posts: 2715
Joined: Fri Mar 24, 2006 1:26 pm

by DaveS

bm0p700f wrote:
Sun Nov 17, 2019 8:23 pm
If you dont like 2t jumps then your ideal cassette is an 11-21T.
Your math skills could use some help 11-13-15-17 sucks, compared to 11-12-13-14-15-16-17, like my 11-34 12 speed has. It's all about the percentage change.
Last edited by DaveS on Mon Nov 18, 2019 1:45 am, edited 1 time in total.

by Weenie


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