On 8/27/2018 1:13 PM, wrote:
Has anyone had any damage to bikes simply from using a rood rack? A friend of mine had his C40 Colnago have its head tube simply break off. To me it looks like a manufacturing error but I wonder if it was caused because for 15 years he was carrying the bike on a roof rack. I can't imagine the bumps and centrifugal force and wind sheers not having some sort of effect.

Was he using a fork mount rack (a bad idea) or a rack where the bike has
both wheels in a tray and bike is held onto the rack by the frame (a
good idea). Newer racks, designed for carbon fiber bicycles, hold the
bike by the wheels, with no frame contact, because you don't want to
damage the carbon fiber tubes with clamps or other hold downs.

But usually it's the fork that is damages, not the head tube.