'THE BIKERIDERS' Rated R for language throughout, violence, some drug use and brief sexuality. What it’s about: Follows the lore of a Chicago biker gang in the 1960s. The kid attractor factor: This is an adult drama, not for kids. Good lessons/bad lessons: Beware the sexy biker, he just might upend your life. Violence: Some extreme bloody violence, including brawls, stabbings and shootings. …