Chris Harris began his racing career at the age of six and a half by competing in grasstrack events. His talent quickly became apparent when he began to win all of the junior age groups in the South-West area. In 1998, aged 15, he turned to speedway racing for the St. Austell Gulls at Amateur Conference League level. The Gulls won the Championship and the Knockout Cup. On his 16th birthday, Harris signed for the Exeter Falcons, who competed in the Premier League, the middle tier of British speedway's three-league structure. Despite the death of his father, who was his driver and mentor, he achieved his first notable individual success later that year, when he became Great Britain Under-16 Champion. He was also selected to ride for Great Britain at both Under-19 and Under-21 level. In 2000, Harris more than doubled his previous year’s points total, being unbeaten by an opponent in several matches. The Exeter Falcons team finished the season as Premier League Champions and reached two cup finals and one semi-final. Harris moved clubs for the 2001 season, joining the Trelawny Tigers in Cornwall. He soon became their top scorer and qualified for the 2001 Individual Speedway Junior World Championship as first reserve. He continued his form into 2002, being made club captain. Once again, he was top scorer for the club and under his captaincy Trelawny Tigers won the Premier Trophy.
Taking advantage of new rules introduced to assist young British riders, Harris also took the step up to ride in the Elite League in 2002, with the Peterborough Panthers. He progressed well during his debut Elite League season, moving up into the main body of the team. Individually, he progressed to the final of the British Speedway Championship and finished fourth in the World Under-21 Championship. In 2003, Harris rode again for Trelawny Tigers in the Premier League and Peterborough Panthers in the Elite League. By the end of the season, he was an Elite League heat-leader. Off track, he was voted BBC South-West Sports Personality of the Year. However, it was on the individual front Harris was most successful. In the World Under-21 Championship, he won both his quarter and semi final rounds, progressing to the 2003 Individual Speedway Junior World Championship in Sweden where he finished runner-up, one point behind Jarosław Hampel. His form during 2003 won Harris an invitation to take part as a reserve in the third round of the 2003 FIM Individual Speedway World Championship, the British Grand Prix, held at Millennium Stadium in Cardiff. 2004 saw Harris sign for the Coventry Bees. The following season, the Bees won the Elite League Championship, which meant Harris had won titles at all three levels of British speedway aged just twenty-two. He also represented Great Britain in the Speedway World Cup. For the 2011 season, Harris moved on loan from Coventry to Belle Vue only to return a season later.
2007 British Grand Prix
In 2007 Harris became British Champion. Harris was selected to ride as a permanent wild card in the 2007 Speedway Grand Prix series, riding at number 15. In only his fifth full Grand Prix meeting he won the British Grand Prix at Cardiff. He was also a victim of an armed robbery, just two weeks before his maiden Grand Prix win when he was held up at gunpoint whilst out with his manager. Winning the Grand Prix was considered to be the biggest event to happen in British Speedway for several years. Off track, he was again voted BBC South-West Sports Personality of the Year. and was also voted BBC MidlandsSports Personality of the Year, beating Aston Villa footballer Gareth Barry into second place.