my Niner is 2.4kg too. 853 main tubes
I've always doubted the "853 main tubes" claim being this heavy AND super flexible. Mine started shifting out of the saddle while bikepacking cause of the frameflex.
All steel basically has the same Young's Modulus. 853 is as stiff as boggo 4130.
@Jaap started
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my Niner is 2.4kg too. 853 main tubes