Steel Trailing Axle Strength

[MRD]

I've got the steel trailing axles on both my X6's but yesterday one snapped after a small tumble. I'd have thought these would be super tough but as it broke that rather than any of the plastic parts it makes me wonder if they're too brittle or did I just get a duff axle?

How is everyone else finding them?

I don't want to be buying these too often really .