I took a tumble on my bike a few weeks back which was a stupid "crash" since i was basically stopped but managed to fall over -- i think the bike just hit the ground at the right place which is where all this started. I didnt notice any damage at this point other than the RD being out of adjustment -- i didnt think anything of it. This is an N+1 bike so i dont ride it all the time, rode it this weekend and was having problems with the RD not shifting correctly -- My initial thought was that the hanger was bent or something along those lines. Noticed the crack and then took the wheel off to inspect more and it just cracked like in the picture. So glad i wasnt riding it when it did finally crack off like that or else i would have been seriously hurt im guessing. Soo.. yeah. lame.