1. Road Rash
This is a whole series of games, where the player participates in violent and illegal street races on motorcycles. Not a biker related game, but it is extremely close. There is a total of six games, Road Rash (1991), Road Rash II (1992), Road Rash 3 (1995), Road Rash 3D (1998), Road Rash 64 (1999) and Road Rash: Jailbreak (2000). The series started on Sega Genesis but has since appeared on various other systems.
Co-op modes are present in some of them, offering competitive gameplay. Different bike models are present, as well as various tracks and surroundings. Weapons and combat are a big part of the games, as you need to battle it out while driving and eliminate the opponents as well as win the race.