Born to an English father and a Brazilian mother Brian Hart lives in Lérida Spain, halfway between Zaragoza and Barcelona. In 2018 Hart took part in the inaugural British Talent Cup season finishing fifth with 99 points. He was invited back to compete in 2019. When not racing in the British Talent Cup, Hart competed in the Dickies Junior Supersport category of British Superbikes. He finished second with 300 points.
In 2017 he rode in the UK in the Santander Consumer Finance KTM British Junior Cup as well as the North European ADAC KTM Junior Cup series. Although he finished third in the UK and second in the ADAC Championship he went on to win the KTM World Final in Jerez.
In the ADAC series Hart was in with a chance of the title up to the final round. Riding at circuits like Brno and Misano it was at Assen that he narrowly missed out on the title after falling in the wet first race. He went on to take victory in the second race. He won 4 races and was on the podium in all six races he finished.
In the UK Hart was busy in the KTM British Junior Cup. He finished third in the overall standings on 315 points. During the season he won five races and stood on the podium a further ten times.
To top it off Brian Hart took part in the KTM Cup World Final in Jerez. He was up against the best riders from all the other KTM championships throughout the world. Hart won the title with a fifth place in race one and second place in the following race.
Back in 2014, Hart got to ride for the team run by Alex Barros in Brazil. Although the season had started and he missed the first two races he finished third overall in the 250GPR class. He then went on to win the GPR250 class in Brazil in 2015 for Barros.
The following year he rode in the RFME Pre-Moto3 series for Monlau Engineering. He finished 11th with a best of fourth at Motorland in Aragon. He rode against quality opposition like Sergio Garcia, Barry Baltus and Andreas Perez. Garcia now rides in the Moto3 Junior World Championship, whilst Perez competed in the European Talent Cup in 2017 and Baltus raced in the final event of the season.