Nowhere But Here, Katie McGarry

This is the first in the four-book Thunder Road series. Emily reluctantly goes to spend the summer with her birth father, the head of the Reign of Terror motorcycle gang. Dad appoints young Oz to protect Emily from a rival gang and romance blooms amid the gasoline fumes. The Harlequin Teen press material tells us McGarry embedded herself with a Kentucky biker club to create a fictional gang.