Crank failure near square taper, Topline

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Topline crank circa 1993-4 failed 2006. Rider weight approx. 64 kgf (140 pounds). Mounted on triathalon bike, used for all types of terrain, standing, seated, long training rides and races from sprint triathlons to 1/2 ironman distance. No crashes. Mounted, only once, to non-servicable bottom bracket, not subsequently removed. Owner estimates over 5,000 miles riding.

Crank still rideable when failure noticed.

Image from owner.

See also FAIL-035.html.