Since "free" keys are generally a myth or a security risk, here are the legitimate ways to get into the game:
The developer regularly tunes the tire model and rider lean physics.
Using a cracked version or a stolen key often results in a permanent ban from the official master servers, meaning you lose the ability to play with the community or use popular mods. How to Get MX Bikes (The Right Way)
Since "free" keys are generally a myth or a security risk, here are the legitimate ways to get into the game:
The developer regularly tunes the tire model and rider lean physics.
Using a cracked version or a stolen key often results in a permanent ban from the official master servers, meaning you lose the ability to play with the community or use popular mods. How to Get MX Bikes (The Right Way)