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PostPosted: Sat Sep 30, 2017 1:48 pm 
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Joined: Tue Jun 23, 2015 9:52 am
Posts: 9
This morning I was installing a new Centaur 11 speed crankset.
I thought I was making a mistake or something else went wrong. The thread of the left crankarm is missing.

Image

Anyone seen this before?


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PostPosted: Sat Sep 30, 2017 2:12 pm 
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Joined: Tue Nov 15, 2016 8:13 am
Posts: 94
Looks like hirth teeth to me. The centre joint is a hirth joint.

https://en.wikipedia.org/wiki/Hirth_joint

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Posted: Sat Sep 30, 2017 2:12 pm 


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PostPosted: Sat Sep 30, 2017 2:50 pm 
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Joined: Tue Jun 23, 2015 9:52 am
Posts: 9
There's no thread on the left arm, so the bolt has no grip.


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PostPosted: Sat Sep 30, 2017 3:54 pm 
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Joined: Sun Jan 05, 2014 11:04 pm
Posts: 179
Location: Denmark
Back to the shop with that, isn’t it missing one of joints teeth missing too?


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PostPosted: Sat Sep 30, 2017 4:16 pm 
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Joined: Fri Oct 28, 2011 3:25 am
Posts: 1462
Location: United Kingdom of Great Britain and Northern Ireland
When you spin your legs an electromagnetic field is created and magnetism holds the cranks together - no need for bolts or threads. Campagnolo call this 'EPS' - Electromagnetic Propulsion System.


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