Axles bending. I know a guy who races a shee, he is 2nd in the district in points. He rode the shee stock axle for about a year. Once he got really good (I mean really good, he is an A rider lapping other A riders) he bent the stocker. he ordered a durablue, bent it on a practice night. After Durablue wanted his firstborn son, they sent a replacement, and he sold it. He is doing sick jumps, clearing triples. I know some b riders on 2 wheels who can't even clear the triple. Anyway, he went to the lonestar and bent 1 about 6 months later, they warranted it no problem, and he has been on it since 4-5 months.