Prior research involving cycling, aggression, extraversion, and skill level is dated and limited. This study attempted to measure the levels of aggression and extraversion in each of the five categories of USCF riders to determine if personality differences existed between the different skill levels. Specifically, what proportion of extraverts versus introverts exist in each skill level and do personality characteristics and skill level effect the occurrence of aggression? Modified versions of the Aggression Inventory (AI) and the 55 Bipolar Rating Scale (55-BRS) were used to assess the subjects' tendencies to use aggression and personality characteristics. Results showed that no category has a particular concentration of either personality characteristic, indicating that the proportion of extraversion/introversion did not increase or decrease with increasing category levels. The results also showed a significant main effect for personality, where extraverts were significantly more likely to use verbal aggression and introverts were more likely to use avoidance techniques to avoid aggression. / School of Physical Education