Campagnolo missing thread

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ncornelisse
Posts: 12
Joined: Tue Jun 23, 2015 9:52 am

by ncornelisse

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?

hambini
Posts: 580
Joined: Tue Nov 15, 2016 8:13 am
Location: Cologne, Germany

by hambini

Looks like hirth teeth to me. The centre joint is a hirth joint.

https://en.wikipedia.org/wiki/Hirth_joint
Hambini Aeronautical Engineer, Polluting YouTube since 2016 - views expressed are my own...

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ncornelisse
Posts: 12
Joined: Tue Jun 23, 2015 9:52 am

by ncornelisse

There's no thread on the left arm, so the bolt has no grip.

Attermann
Posts: 916
Joined: Sun Jan 05, 2014 11:04 pm
Location: Denmark

by Attermann

Back to the shop with that, isn’t it missing one of joints teeth missing too?

Valbrona
Posts: 1629
Joined: Fri Oct 28, 2011 3:25 am
Location: United Kingdom of Great Britain and Northern Ireland

by Valbrona

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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