Iron Rattler is a steel roller coaster located at Six Flags Fiesta Texas in San Antonio. The ride originally opened in 1992 as Rattler, the tallest wooden roller coaster in the world. It was converted to steel in 2013 by Rocky Mountain Construction (RMC), led by designer Alan Schilke, and reopened as Iron Rattler. RMC installed their patented I-Box track onto Rattler's existing wooden structure, increasing the drop height from 124 to 171 feet and the maximum speed from 65 to 70 mph. A notable addition to its layout was a zero-g roll inversion, which was a first among hybrid coasters made of wood and steel.