Is it possible to modify a wheel blueprint’s parameters based on what physical material the wheel is touching?
For example: when wheel touches surface A, set wheel slip threshold to x?
Hey @MarzipanStan! Welcome to the forums!
There absolutely is! You can try to do a sphere trace exactly sized for the wheel, and use a branch to determine if the ground below is different from normal ground.
Now you would want the additional ground types to have a certain unseeable volume on their own for the vehicle to interact with. You wouldn’t use the terrain for this purpose.
Now something like rain? You’d get whatever that is, like “current weather” or however you set it up, then set the friction variable to x. 
There are MANY ways to go about something like this, it’s all about how your previous setup looks.
Okay, thanks - I don’t know what some of those key words mean, so I’ll look into them and mark this as solved if they do the thing I’m thinking of