 Pamakwikwi e2012 United States Olympic Trials muOmaha, Nebraska, Weir akaita chikwata cheU.S. cheOlympic kechipiri paakapedza ari wechishanu mumamita zana akasununguka aine nguva ye54.41, izvo zvakamuita kuti akwanise kushambira mumamita mana × zana akasununguka senhengo yechikwata cheU.S. relay. Mumitambo yeOlympic ya2012 muLondon, akahwina menduru yebronze senhengo yechikwata cheU.S. mumakwikwi evakadzi e4 × 100 metres freestyle relay. 