broken steertube

[dddd]

Certain brands of vintage steel road bikes once came from the factory with a length of hardwood inside the lower end of the steer tube, for when the steer tube failed above the crown!

Perhaps a length of fitted balsa could be bonded into the upper end of a carbon steerer and also serve as a nut/anchor for the hold-down bolt?

I built up an older Cervelo aero frame recently where the carbon steer tube was lined with a thin aluminum tube, and with a star-fangled nut installed. It looked "factory" to me.

The steer tube was a little harder to cut and no doubt a good bit heavier than usual.

[Jeff N.]

Wow...just wow.

[DRietz]

I think this is a sign that you’re pulling too much while doing your big rigg workout - let your legs do the work!

[Kontact]

In regards to my statement that the stem being all the way down without a spacer might have contributed to forming a stress riser, this is exactly what Trek cited in the 2010 Madone steerer tube failures:



http://www.velonews.com/2010/06/news...ulletin_121428