I've been havin problems with my Truvavtiv chainrings bending under normal pedaling. I've had the most problems with the middle ring (the one i use the most) I never bash it on logs or rocks, so I assume its the load applied when pedaling. I was wondering if ya all have heard of this or know whats going on. Oh yeah, and if someone knows the standard allen crank bolt size, I would be much obliged, I have a terrible memory.....Thanks!