I honestly have no idea, it is not a chainline issue chainline's perfect. Every chain I snapped on a fixed gear has been 1/8th, yet when I had the pista, I never had chain problems and was running 3/32nd. Same with the dmr 3/32nd chain, no poblems. The one I did snap recently on the dmr, I know how that happend, twisted link. Guess I should check the frame before riding it again.