Joined: May 2008
Posts: 10,106
Likes: 2,762
From: Fredericksburg, Va
Bikes: ? Proteous, '65 Frejus TDF, '73 Bottecchia Giro d'Italia, '83 Colnago Superissimo, '84 Trek 610, '84 Trek 760, '88 Pinarello Veneto, '88 De Rosa Pro, '89 Pinarello Montello, 'Litespeed Catalyst'94 Burley Duet, 97 Specialized RockHopper, 2010 Langster
Hmmm... strange. I would not have expected a crack in that location with that orientation! Are your chain ring bolts uniformily tight?
There is a nick just inside (below) the radius on the edge where the failure is. Do you know where or how it was created? That may have been the location of the force that caused the crack.