the attempt. Riders are required to be part of the athlete biological passport program. However, of the men to attempt the record since the rule change, only five were on a UCI World Tour team at the time: Jens Voigt of Trek Factory Racing, Rohan Dennis of the BMC Racing Team, Alex Dowsett of the , Victor Campenaerts of Lotto Soudal, Filippo Ganna of Ineos Grenadiers. Matthias Brändle was with IAM Cycling, then a UCI Professional Continental team. Jack Bobridge was on Team Budget Forklifts, an Australian UCI Continental team. Thomas Dekker had been released from World Tour team Garmin–Sharp several months before. Gustav Larsson was riding for the Professional Continental team Cult Energy Pro Cycling, whilst Bradley Wiggins had left the World Tour's shortly before his attempt, which was made in the colours of his own UCI Continental team . As of October 2022, 26 attempts have been made for the men's record, eight successfully, while nine attempts have been made on the women's record, six of them successfully. Unified hour record attempts (men's) Following the change in the rules, German Jens Voigt became the first rider to attempt the hour, on 18 September 2014 at the Velodrome Suisse, Grenchen, Switzerland. He set a new record of , beating the previous record set by Sosenka by . On 30 October 2014, Matthias Brändle set a new record of at the World Cycling Center in Aigle, Switzerland. Further attempts by Australians Jack Bobridge and Rohan Dennis, and the Dutchman Thomas Dekker came within a few weeks, between 31 January and 25 February 2015. Dennis was the only one of the three to set a new record, and in doing so was the first rider to cover more than . Dekker's attempt at the Aguascalientes Bicentenary Velodrome was the first attempt to take place at appreciable altitude. Aguascalientes is at above sea level, while Melbourne is at only , and, although in Switzerland, Grenchen and Aigle are at and respectively, and not in the mountains. High altitude is thought to result in faster times, providing the rider takes the time to acclimatise to the conditions. This is because the air density decreases with an increase in altitude, which reduces the aerodynamic drag. Having postponed an earlier scheduled attempt due to a broken collarbone incurred in a crash while training, British cyclist Alex Dowsett exceeded Dennis's mark, with a new record of