Senior Member
Join Date: May 2008
Location: Fredericksburg, Va
Posts: 9,579
Bikes: '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, '94 Burley Duet, 97 Specialized RockHopper, 2010 Langster, Tern Link D8
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Broke one and ordered 2. Need to be gentle with them. The serration is useless. I always use two Allans. The force on the bolt is on the post side. When it is tightened , a bending force is applied to the bolt, stretching the post side. As you tighten it, the stress increases with the rotation with deformation rotating with the screw on the threaded side. Then POP!
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Bikes don't stand alone. They are two tired.