So on doing research about a new wheel, tires, and suspension setup I did some research and found out that the BMW M4 GTS unsurprisingly runs a different setup then the BMW M4 ZCP. My question is the GTS runs 19 x 9.5 fronts on 265/35/19s and 20 x 10.5 fronts on 285/30/20s, while the standard ZCP runs 20 x 9 265/35/20s and 20 x 10 285/30/20s, why would they make the wheel wider? Isn't the tire just stretched more with the wider wheel and the wheel is heavier? I also know that the GTS runs Michelin Sport Cup 2's which obviously don't run super stretched like the MPSS. The only possible reasons for this I can think of is so they could camber the wheels for cornering? I'm no expert but the other conclusion I've come to is that 19 in the front will allow better cornering while 20 rear will extend the length of the contact patch.
Furthermore, I'm currently debating a new wheel and tire setup, where I took inspiration from this setup and planned on getting the V-FF 103's from Vorsteiner in 19 x 9.5 with 275/35/19R MPS4S and 20 x 10.5 305/30/20R MPS4S, I'm by no means an expert and have a lot of learning to do but this should give better straight line performance while still breaking sideways when I want it to and cornering better, additionally the wheels would be lighter. I'm currently on stock 20" ZCP setup. I'm lowering on Swift Spec-R's all though KW HAS is alluring as I'd like that rake look the GTS has and I don't think the wheels will provide it.
Source >
https://bimmertips.com/oem-bmw-f82-m...l-style-specs/
P.S the CS also runs 19 front 20 rear but the same width as ZCP
- Callan