Iron Rattler is a steel roller coaster located at Six Flags Fiesta Texas in San Antonio, Texas. The ride opened in 2013, replacing The Rattler, a wooden roller coaster, by putting a new steel track on top of The Rattler's wooden support structure The distance between the lowest and highest points of the first drop was increased from 124 to 171 feet (38 to 52 m) and the drop was made steeper by changing the angle to 81 degrees. The resulting modifications increased the speed of the trains from 65 to 70 miles per hour (105 to 113 km/h). It is the first hybrid wood and steel roller coaster to feature an inversion, in which riders are turned upside-down and then back upright.