Yes, not a good idea. I had a crank relieved like this on a modia, one arm cracked and if you road it long enough they all will. These arms are basically cantilever beams and relieving them makes them two much weaker beams. The sugino comps have beefier spiders designed as a relieved arm at the start. Brian Blum
>From: "David Bean" <beandk@rcn.com>
>Reply-To: beandk@rcn.com
>To: "CR List (E-mail)" <classicrendezvous@bikelist.org>
>Subject: [CR]Pogliaghi and lightened crank spider
>Date: Fri, 24 Aug 2007 08:57:42 -0400
>
>When the Campy crank spiders are hollowed out (like on Jack's beautiful
>Pogliaghi) they look fragile. Does this treatment actually weaken them
>noticeably?
>
>David Bean
>Arlington, MA
>beandk at are-see-enn dot com