When using this hub, I have broken one frame at the seat cluster in a crash without losing chain tension. Another hub survived bad chain throw - the kind when the chain wounds upon itself on a cog while catching pedal. All the damage that happened was some scratches on the carbon spacer. I have been using pictured bloodlines reborn hub on my rain / off road/ winter commuter (actually commuting in the winter) since May 2007 - still going strong. I guess, I have overbuilt it if anything.