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Just to preface what I'm about to say I have one of those Niner forks, and I've never snapped a carbon fork blade. I have however snapped three carbon fork steerer tubes. I always think that Niner video isn't really dealing with the real issue for carbon fork durability, which is idiots like me who can't find their torque wrench
fredtc-
Yeah, the video is a gimmick, you're never going to put much load into the most highly stressed part of the fork if you're holding it in your hand. Their point though is sound; if you build a carbon fibre structure well, you'll exceed the strength of a steel analogue well before you reach the same weight as the steel version.
gbj_tester
No results known for the steel one, but the carbon one went three times the regulated duration on the fatigue test after the demo video
https://www.youtube.com/watch?v=6QNRpSkTGoA
The advantage of steel is not that it's inherently stronger or tougher, it's that it's usually easier to read the damage from the outside