A review of certain aspects of the Consumer Rating and Assessment of Safety of Helmets (CRASH) for motorcyclists was undertaken. The paper examines the relationships between the assessment of helmet stability with volunteers and other usability assessments. The paper reports on how these assessments are incorporated into the Consumer Rating and Assessment of Safety Helmets (CRASH) and general relationships between Safety Scores and Ergonomic Scores. Ninety (90) motorcycle helmets were evaluated in the years 2011 to 2014 involving dynamic stability tests, dynamic strength of retention tests and usability tests with six participants. All helmets complied with AS/NZS 1698:​ 2006. The participants rated each helmet across ten items using a five point Likert scale. Forward, rearward and lateral pull tests were performed on each participant with each helmet. The force required to move the helmet with respect to the scalp was measured. The analysis revealed a number of important findings. First, safety performance tests are not correlated with ergonomic assessments of the helmets, including formal usability assessments. This observations highlights the importance of providing both safety and ergonomic information to motorcyclists. Helmet mass ranged between approximately 1 kg and 2 kg in the sample assessed. On the assumption that the total Safety Score reflects a helmet that offers greater protection in a crash, a heavier helmet within the sample assessed offers more protection to the motorcyclist. Full face helmet types also performed better on total Safety Score than the open face helmet. Full face helmets were heavier than open face styled helmets. Differences in the total Ergonomic Score by helmet type were fewer than those observed with Safety Scores. There were strong correlations between the rater responses between pairs of questions regarding comfort, fit, but not restraint adjusment. Although there is some overlap between these questions, each question appears to elicit a slightly different response across all helmet types and raters. Helmet mass is either not correlated or weak to moderately correlated with user ratings. This suggests that the raters are considering other factors, not simply mass, when rating helmet weight. The raters might be considering the mass distribution, for example. In general, helmet stability as measured quasi-statically on each rater was weakly associated with the raters’ assessment of the helmet. This suggests that the motorcylist’s impression of fit is not a strong indicator of helmet stability. Ease of use of operation was only weakly associated, based on these results, with the forces required to displace the helmet on the rater’s head. Correlations between the stability test forces by direction (front, rear and lateral) were strong.