• However a sharp sideways impact can break a spoke fairly easily so it could have been either.

    O rly? Spoke breakage from impact is very rare, usually the hub flange or rim eyelet lets go first, or nothing gets overloaded (apart from the rim in bending) as the wheel transitions between its two stable conditions, circle and taco.

    To the OP, look at where the spokes broke and how. It should be easy to tell the difference between a pre-existing fatigue crack which suddenly propagated under the abnormal sprinting load and a plastic failure due to severe overload in the aftermath of a crash. If you don't know what you're looking at, ask a friendly metallurgist. You might have been riding for weeks or even months on the road with half-broken spokes which finally let go and caused the loss of control when you sprinted.

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