So I wonder if any of you have ever heard of this... Some guy was telling me at Cahuilla that XR650R's break Ironman rear sprockets. I'm wondering if anyone has ever heard of this before? I've always thought that Ironmans were one of the strongest sprockets out there and it would be as bummer if I was going 80 m.p.h in the dez and the sprocket shatters. Anyone have any input on this one?