I’m a complete noob to wheel fitment and offset, any help would be appreciated. For my question…would 19x8.5 wheels with a 25mm offset work for a square setup on 2012-2014 mustang gt? And what is the widest tire I can put on a 8.5?
Go to Late Model Restorations website and check out the S197 wheel section. even if you don't see anything you like, you can look at the wheel specs so you can see what fits. https://lmr.com/products/10-14-Mustang-Wheels
I have their SVE R350 wheels on my 12. Fronts are 19x10 with 285/35 tires offset is +35mm. Rears are 19x11 with 305/35 tires offset is +50mm. The fit is perfect