The incidence of cycling‐related injuries in the USA has increased in recent years, with the head being among the most commonly and seriously injured body parts. Current bicycle helmet standards present limited representation of real‐world cyclist accidents. Researchers generally agree that evaluating helmets using oblique impacts, which are common in cyclist impacts, could enhance helmet design. However, the boundary conditions across various oblique impact rigs vary widely. The purpose of this study is to evaluate effects of the anthropomorphic test device (ATD) headform and neck on dynamic response in bicycle‐helmeted, oblique impacts. A Hybrid III (HIII) and National Operating Committee on Standards for Athletic Equipment (NOCSAE) headform were impacted in drop tests onto an angled anvil with or without a HIII neck. Both headforms produced similar linear response (0.4% average difference in peaks, p=0.76), while rotational velocity and acceleration peak responses were ~22% and 31% greater for the HIII (p<0.01). The headform‐only tests produced 17‐35% greater peak linear and rotational values than the tests with a neck, although impact location influenced neck effects. Trends in these results can be used to interpret differences across published bicycle helmet oblique impact studies and have important implications for injury risk.