Born in
Townsville,
Queensland, Grajczonek's big break in British Speedway came as an 18-year-old with the
Glasgow Tigers. During four years with the team he won his first major trophy as a Speedway rider, the 2011
Premier League. For the majority of his time in Britain he has 'doubled-up' riding for a team in both the
Elite League and the Premier League. In 2013, he won the treble with
Somerset Rebels; the league, cup and
Premier League Pairs Championship partnering
Jason Doyle, during the
2013 Premier League speedway season. After spells with both the
Belle Vue Aces and the
Swindon Robins in the Elite League, Grajczonek experienced two successful years riding for the
Poole Pirates. In two full seasons with the team he won the Elite League on both occasions. Despite being a part of such a successful period with the club he was initially left out of the teams plans for the 2015 season and it looked as though he would be left without an Elite League club for the 2015 season. However, after an unfortunate injury to fellow Australian
Davey Watt shortly before the start of the season Poole turned to Grajczonek and drafted him in as a temporary replacement. In 2016, he won the Premier League Pairs Championship for the second time, this time partnering
Rohan Tungate for Somerset Rebels, during the
2016 Premier League speedway season. Grajczonek is an eight time
Queensland Solo Champion, winning the title in 2009, 2011, 2012, 2013, 2014, 2015, 2020 and 2023. In 2018 and 2019, he rode for Poole once again in the
SGB Premiership. ==World Championship Appearances==