An Epidermiologic study was carried out in the dry season on 250 commercial motor bike riders from five different parks. 69% of the bike riders were in the 31–40 and 41–50 age range. Arterial hypertension was found in 25% of the examined workers (p<0.05), Borderline hypertension was found in 26% of the workers (p<0.05). The severity of the hypertension increased with the age of the workers and the 31–40 age range had the highest incidence of hypertension accounting for 24(38%) of the total 63 frank cases of hypertension. The severity of the hypertension increased linearly with their duration of exposure to commercial motor bike riding (r=0.6, P<0.05). Heart rate showed a progressive increase with age but a drop was observed in the 51–60 age range. The characteristics of the hypertension structure and it,s interesting relation to age, number of years of commercial bike riding ,heart rate and body weight is discussed. Of particular interest is the significant number of young adult bike riders found to be hypertensive. KEY WORDS: Hypertension, commercial bike riders, Benin City. Ref.1 Iyawe VI, Ebomoyi MIE, Chiwuzie JC, Alakija W 2000 Some factors that may affect blood pressure in Nigerian cement factory workers: Journal of Biomedical research vol 3, pp117–121.