All The Six Fifty Bees Thread! (650b, 27.5 etc.).

Is alu more prone to cracking than steel?

Yes, for a similar stress, alu have a higher chance of cracking.

That said, it's not difficult to get alu to fit perfectly and not crack, just that if you fitted it a little too tight, then it will crack at some point.

Ill-fitted steel mudguard still retain it shape.