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Campagnolo missing thread

Posted: Sat Sep 30, 2017 1:48 pm
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?

Campagnolo missing thread

Posted: Sat Sep 30, 2017 1:48 pm
by Weenie

Re: Campagnolo missing thread

Posted: Sat Sep 30, 2017 2:12 pm
by hambini
Looks like hirth teeth to me. The centre joint is a hirth joint.

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

Re: Campagnolo missing thread

Posted: Sat Sep 30, 2017 2:50 pm
by ncornelisse
There's no thread on the left arm, so the bolt has no grip.

Re: Campagnolo missing thread

Posted: Sat Sep 30, 2017 3:54 pm
by Attermann
Back to the shop with that, isn’t it missing one of joints teeth missing too?

Re: Campagnolo missing thread

Posted: Sat Sep 30, 2017 4:16 pm
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.