Custom sized Wheels and Tires

Hello all, I have been attempting to create larger wheels and tires for the D-Series and have run into an issue with the texture (Flexbody?). I was able to upscale the tire physically to the desired size, but I have been unable to modify the wheel width. I was unable to narrow the tire in any way, and I also was unable to widen the wheel. If anyone could point towards which value on either the wheel or tire I would need to edit to change width, it would be of great help. (Included screenshot shows the gap between the wheel and tire I am unable to remove)
--- Post updated ---
Sorry, Just fixed the problem. Realized I needed to edit the offset and not the width. Ignore this thread