Alright, it's time for round 2!
Softened the mesh at the spokes, rendered with a chrome texture. Added sidewall buldge, though the tire could really use some real texturing.
Once I'm done with my next little bit (should be soon and I'll post it) I'm going to take the model out of SketchUp and into blender.
Then I'll be applying a full texture and UV map. I just need to figure out how to apply the chrome texture to the UV-mapped model. But I've got a pretty good idea how.