Wrestling by seven weight classes—47.6 kg (104.9 lb), 52.2 kg (115.1 lb), 56.7 kg (125.0 lb), 61.2 kg (134.9 lb), 65.3 kg (143.9 lb), 71.7 kg (156.7 lb), and greater than 71 kilograms —was an important innovation in the Summer Olympics.