Ok, So i made this model in blender its a little rough(first time touching a 3d modeling software) Its a set of rims and im wondering how can i put a tyre on it and how do you make beamng able to use the model. Rim i Modeled^
First, your rim is really to big. Its the size of the blender grid because you have used it for reference. Now you need to scale it down like less than 1 block To "declare" the rim in a jbeam. Take a look at game/content/vehicules/common.zip/vehicules/common/wheels/steelwheels_R_5.jbeam you need to change the name of the mesh in the flexbodies thing. in slots you can set what type of tire you can choose to put on your rim and you can decide if you allow hubcap or not