Hm there are 2 bikes at that place. Meet The Contestants is that the mission with the dude on the green bike that rides around and try to kill you? That bike gets unlocked after you kill him, and there you get the custom paint job trophy, when painting it with a spray can in the trailer. The other bike is at the other end, where you go get the girl shooting with a 9mm handgun. Is that bike locked aswell? There are also a MC bike in a casino, and then there are 2 cars? A hummer and the sport car. Both of these car keys can get obtained in the Pawn shops. To get money for them just play online, will not take long time to get the cash needed. I dunno if the other red bike is locked? Please confirm this, would be good to know. There is also a black bike in underground, wich you can go get after finish the case mission there. Also you always have these small cars, dont know what they are called in english we call them for "golfbilar" in swedish, wich would simple be golf cars but dunno what you guys call em

They get smashed quite fast tou but still a ride!
also Im asking about the red bike because I didn't do the Meet The Contestants mission the first time, but I could still ride the Red bike.