How yo unlock a new bike in MX vs ATV untamed?

To unlock a new bike in MX vs ATV Untamed, you typically need to complete certain challenges or objectives in the game, such as winning races or achieving specific milestones in career mode. Additionally, some bikes may require you to accumulate a certain number of points or finish at a certain rank in events. Be sure to check the in-game unlockables menu for specific requirements for each bike.