ruined my second iro hub today. The only common demoninator is cheap german cogs (less then 14$). Just finished my wheels myself too. On even the slightest chance it had to do with the cog, i am going all out from now on. PS the hubs were a stock bianchi and an iro hub. Is a nicer hub worth it? In nicer i mean better then iro or surley. Miche hubs look cool but i think i am forever dedicated to fixed/fixed incase the problem repeats. Dura ace? Relacing wheels sucks.