Youth illegal racers who adhere to socially defined masculinity ideals often engaged in illegal racing and aggressive behaviours solely to demonstrate the assertiveness of masculinity. This mixed-method study was carried out to investigate the extent of masculine identity among young motorcyclists and how it affects street racing and aggressive behaviour. Phase 1 of this study was conducted in December 2020 involving a group of young illegal racers in Penang, Malaysia and the masculine identity levels were measured using the Conformity to Masculine Norms Inventory-22 (CMNI-22) survey. The association between masculine identity, illegal racing status (Model 1) and aggressive behaviours (Model 2) was determined using Multiple Logistic Regression. Phase 2 of the study explored the meaning of self-perceived masculine identity among 400 young motorcyclists. Participants that had high masculine levels were found to be four times more likely to a racer (95% Confidence Interval (CI) 3.57, 6.12; P = 0.001) and five times more likely to commit aggressive behaviours (95% CI 3.57, 6.12; P = < 0.001) compared those with low masculine identities. This study revealed that illegal racers perceived masculine identity as having a macho appearance, exhibiting playboy behaviours, and driving recklessly. This study demonstrated the need for a special awareness program that helps youths to explore their masculinity and channel it in the right way.