There's no battle of the bay like the Big Game. Cal vs. Stanfurd is the only real rivalry anymore, because there's true separation. Nobody cares about teams who blow ass all day like the Raiders and 49ers.
49ers fans are mostly just pussies who don't drink enough anyway... my cousin from San Mateo got kicked out of the stadium for standing up, yelling, and telling the team A: to stop sucking and B: to start playing with heart. He stopped being a 49ers fan on the spot... and decided to only follow college.
49er fans leave in the 3rd quarter to beat the traffic home.. it's happened every time i've gone to one of their games, and it happens even if they arent getting blown out. It's fucking weird.
meanwhile, Raiders fans suck, because nobody actually shows up to games unless they love halloween that much.... I cant blame them really, since they've been awful for years now... but they notoriously wont sell out and its pathetic compared to other teams.
That said, Least their diehards are loud, obnoxious, facepainted, and drunk as football fans SHOULD be.