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That's a good question, that is hard to answer. It could be a combination of things, the car may not make contact just before the wreck, but something could have happened multiple nights ago that could have damaged the axle and it just finally gave out. I would say lightweight axles, excessive re-straightening, and not noticing cracks would be the main cause. And many times all three. Personally I don't believe lightweight axles provide much advantage. Not sure how much weight is saved, but I couldn't believe it is much. There is always the argument that lw axles have less rotating weight, but the radius of which that weight is rotating at is less than an inch so that advantage is slim to none. I believe the risk-reward of LW axles is not worth it, especially when you see how hard sprints and midgets are run.
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