KMC X12 Chain on Campagnolo 12 speed 50 34

Discuss light weight issues concerning road bikes & parts.
graeme_f_k
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by graeme_f_k

kdviner70 wrote:
Sat Apr 13, 2019 7:11 pm
wilwil wrote:
Sat Apr 13, 2019 3:48 pm
kdviner70 wrote:
Sat Apr 13, 2019 3:14 pm
connector.jpg
ome rodriguez wrote:
Sat Apr 13, 2019 4:27 am
I use kmc missing link 12 and sram eagle 12 power link on my campagnolo 12 speed chains with no problems
Hmm - I wonder what I did wrong? I tried twice to lightly press the missing link 12 into the new Campy chain. Any tips? Just to make sure, is this what you are using?
I have just bought these missing links and notice it doesn't say Campagnolo on the packet but does on their website. There isnt a specific Campag version. I bought them to carry for emergencies because as Calnago said, theres no reason to use them with 12 speed. I have heard and I really dont know if its true that the Campag 12 speed chain is noisy and some people are using the new Sram 12 speed chains.

Ive used KMC links on Campag 11 speed with out problems but I dont reuse them like some do. KMC chains were never an improvement over Campag with 11 speed.
Let us know if they do fit. That will prove I did something wrong.
The dimension figures quoted neglect tolerances.

Campagnolo don't reveal their maxima / minima for any component dimension - so KMC are just guessing in their manufacture - if you had a Campag chain near the max of it's over-link-plate tolerance and a KMC joining link at the minimum of their pin length / joint step tolerance, it's entirely possible that you might find it difficult or impossiblle to close. 0.05mm doesn't sound like a lot in terms of pin length difference but it's still the difference between a light interference fit and a clearance fit ... as a material example, the difference required to secure an old-school headset into a frame is only 0,075 - 0.1mm and they are tight enough to need a press to insert ...

If it did close, it could fail. I have about 20 joining links of various formats I have collected over the years with various failure modes. When customers ask me why I only ever recommend them as an emergency get-you-home, I just pour out my little container of failed links.

A properly rivetted chain is exceedingly unlikely to fail but it does have to be done correctly - it's not about being in the 21st century or otherwise - it's just good engineering and correct tool use.

Please remember, if you fit a third party chain or a joining link and you suffer a failure of any sort in the transmission, Campagnolo are not bound to honour any element of the warranty on your shiny new groupset, any more than Shimano or SRAM are if you mix and match their components ... your chances of needing to avail yourself of that warrnty are very, very small, admittedly - but users do need to be made aware of that fact.
A Tech-Reps work is never done ...
Head Tech, Campagnolo main UK ASC

by Weenie


kdviner70
Posts: 128
Joined: Mon Sep 25, 2006 11:10 pm
Location: Wyoming

by kdviner70

graeme_f_k wrote:
Mon Apr 15, 2019 3:21 am
kdviner70 wrote:
Sat Apr 13, 2019 7:11 pm
wilwil wrote:
Sat Apr 13, 2019 3:48 pm
kdviner70 wrote:
Sat Apr 13, 2019 3:14 pm
connector.jpg
Hmm - I wonder what I did wrong? I tried twice to lightly press the missing link 12 into the new Campy chain. Any tips? Just to make sure, is this what you are using?
I have just bought these missing links and notice it doesn't say Campagnolo on the packet but does on their website. There isnt a specific Campag version. I bought them to carry for emergencies because as Calnago said, theres no reason to use them with 12 speed. I have heard and I really dont know if its true that the Campag 12 speed chain is noisy and some people are using the new Sram 12 speed chains.

Ive used KMC links on Campag 11 speed with out problems but I dont reuse them like some do. KMC chains were never an improvement over Campag with 11 speed.
Let us know if they do fit. That will prove I did something wrong.
The dimension figures quoted neglect tolerances.

Campagnolo don't reveal their maxima / minima for any component dimension - so KMC are just guessing in their manufacture - if you had a Campag chain near the max of it's over-link-plate tolerance and a KMC joining link at the minimum of their pin length / joint step tolerance, it's entirely possible that you might find it difficult or impossiblle to close. 0.05mm doesn't sound like a lot in terms of pin length difference but it's still the difference between a light interference fit and a clearance fit ... as a material example, the difference required to secure an old-school headset into a frame is only 0,075 - 0.1mm and they are tight enough to need a press to insert ...

If it did close, it could fail. I have about 20 joining links of various formats I have collected over the years with various failure modes. When customers ask me why I only ever recommend them as an emergency get-you-home, I just pour out my little container of failed links.

A properly rivetted chain is exceedingly unlikely to fail but it does have to be done correctly - it's not about being in the 21st century or otherwise - it's just good engineering and correct tool use.

Please remember, if you fit a third party chain or a joining link and you suffer a failure of any sort in the transmission, Campagnolo are not bound to honour any element of the warranty on your shiny new groupset, any more than Shimano or SRAM are if you mix and match their components ... your chances of needing to avail yourself of that warrnty are very, very small, admittedly - but users do need to be made aware of that fact.
I think I under stand what you are saying. So when the Campy website states that the new 12 speed chain is 5.15 mm is that an average?

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