biker

1. N-COUNT Bikers are people who ride around on motorcycles, usually in groups. 骑摩托车的人 (尤指团体)

There are always fights going on between rival bikers. 在敌对的摩托车手之间总是发生着冲突。

2. N-COUNT People who ride bicycles are called bikers. 骑自行车的人[美国英语]