Drag Racing Safety- Chassis > Roll Barshttp://www.dragracingsafety.com/tube-chassis/roll-bars/Motorsport Safety Directory Roll bar fabricators and rollbar kit suppliers.NHRA Roll Bar Rules & Specificationshttp://www.dragracingsafety.com/tube-chassis/roll-bars/detail/link-30.htmlDetailed NHRA roll bar rules & specifications for cars running in NHRA sanctioned events.  UPDATED - The roll bar rules are no longer online, you must now buy the rulebook from  NHRA.Thu, 16 Oct 2008 23:34:13 GMT