, at Manchester Velodrome on 2 May 2015. On 7 June 2015, Sir Bradley Wiggins broke Dowsett's record, by completing a distance of at the Lee Valley VeloPark in London. On 16 April 2019, Victor Campenaerts was the first to exceed 55 km/h by completing a distance of at the Velodromo Bicentenario in Aguascalientes. The UCI rules require an athlete to participate in its anti-doping system, including having a biological passport. When Daniel Bigham rode to break Wiggins's British national record on 1 October 2021 he was ineligible to attempt the UCI record as he was not part of the anti-doping system, estimating it would cost him £8,000. Unified hour record attempts (women's) The last women's hour record before the unified rule change was set on 1 October 2003 by Leontien van Moorsel, with a distance of . In December 2014, it was announced that British Paralympian Sarah Storey would be the first woman to attempt the record following the unified rule change. She attempted the record on 28 February 2015 at Lee Valley Velo Park in London, setting new British, Para-Cycling and Masters Age 35–39 records but missing out on the Elite record with a distance of . American Molly Shaffer Van Houweling broke the women's UCI Hour Record, riding a distance of on 12 September 2015 in Aguascalientes, Mexico. Van Houweling had set three new US Hour Records in the year prior. The first was set on 15 December 2014, in Carson, California, with a distance of . The second was set on 25 February 2015, in Aguascalientes with a distance of . The third was set on 3 July 2015, also in Aguascalientes, with a distance of . This last mark was also the Pan-American and World Masters Age 40–44 record at the time, and exceeded the distance of the UCI hour record of van Moorsel. However, it did not qualify as the UCI Hour Record because Van Houweling had only been enrolled in the athlete biological passport program for three and a half months prior to setting this record. The UCI requires that riders be enrolled in this program for 5–10 months before they are eligible to set this mark. From 24 August 2015, Van Houweling was eligible to attempt the UCI Hour Record. In October 2015, Australian rider Bridie O'Donnell announced her intention to aim for the hour record in January 2016. She broke the