International competitions such as the Olympic Games led to more standardisation: two-straight oval tracks quickly became the norm, and gradually lap lengths reduced. The Vélodrome de Vincennes, used for the 1896 (and 1924) Games was per lap, while Antwerp's Vélodrome d'Anvers Zuremborg, used in 1920, and Helsinki Velodrome, used in 1952, were both . By the 1960s, tracks of length were commonly used for international competitions (e.g.: the Agustín Melgar Olympic Velodrome used for track cycling events at the 1968 Summer Olympics, and Leicester's Saffron Lane velodrome used at the 1970 and 1982 Track Cycling World Championships). Since 1990, such events are usually held on velodromes with laps. London's 2012 Olympic velodrome and a new velodrome in Turkmenistan's capital city Ashgabat both have a 250 m track and a 6,000-seat spectator capacity.