To answer your question Alex: they're probably a little weaker. But I doubt it's enough to make a real-world difference. The way the wheel mates to the hub means the fatigue point should be outside the circle of the bolt holes, so even if there are extra holes, they probably won't cause the wheel to fail... at least not at some level of impact that wouldn't otherwise ruin the wheel/tire.
You're probably more susceptible to failure when running them on the smaller 5x100 holes, but that would be on the lighter car anyway.
The real question is: why would Braid sell the wheels if there was a significant strength issue?
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