From Longman Dictionary of Contemporary Englishbikerbik‧er /ˈbaɪkə $ -ər/ noun [countable] 1 TTCsomeone who rides a motorcycle, especially as part of a group Most of the bikers rode Harley-Davidsons.2 someone who rides a bicycle trails for bikers and hikers
Examples from the Corpus
biker• The hip rediscovered black biker jackets and postured and sneered in them and wore them to class.• Male biker seeks female for touring fun.• On weekends the Hub buzzes with fellow mountain bikers and outdoor enthusiasts resting and socializing.• He is not Troy Aikman, but neither is he a renegade biker or a glass-eating zany.• And even the police were reluctant to spoil the bikers day.• Pasaret's friends describe him as being like a preppy nerd picking a fight in the toughest biker bar in town.• When biker chic turned up at ladies' luncheons, the young were pressed to find a new look. 