When using Zmodeler, how do I find what artifact or texture is causing me to have silver tires on my police bike?

The color of the wheels in ZModeler doesn't necessarily reflect what it looks like in-game, as long as the material is set up properly. Checkered textures are missing textures, you can filter them in the texture browser and replace them with the correct texture. However, it is only required to add the correct textures in the .ytd files, the appearance in ZModeler does not matter as long as the name is correct.