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      11-04-2020, 09:50 PM   #1

Drives: BMW M4 ZCP, BMW E90 M335XI
Join Date: Apr 2020
Location: Boulder, Colorado

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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.

- Callan
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      11-05-2020, 10:05 PM   #2
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Drives: Mineral White ///M4 (sold F80)
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I don't know either but I would like to see the reasoning on how the wheel/tire combos were decided between the GTS and CS.

I know it's not this simple but according to TireRack, the tread width on the Cup2 GTS specific rear tire is 0.4" wider than the MP4S or MPSS Bmw tires (9.9" vs 10.3" wide, same section width), answering the 0.5" wider GTS wheel question. But(!) the Cup2 265/35/19 front tire is 0.3" narrower than the 265/35/20 MP4S or MPSS. So that kinda throws out the basic idea that a Cup2 is just a wider tire overall, hence needing a wider wheel width to control tire roll.
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      11-06-2020, 03:56 AM   #3
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Drives: '15 M4 BSM
Join Date: Aug 2012
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The slight stretch on the GTS tires are to make it more nimble, better turn in with less sidewall flex & gives more precise feedback. The GTS was designed more towards a track purpose feel. I had the vorsteiners on my old M4 and did the wider tire size and had more HP. On this one I have the same wheels but went down to the 265/285 which has some stretch and less sidewall and the handling in the mountains are so much better.....

Just my opinion
IG: horsepower_and_hounds
'15 M4 BSM DCT CCB, '15 Alfa Romeo 4c coupe "sold", '18 M2 "sold", '15 M4 "totaled", '14 M235 "sold", '09 128i "sold"
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f80 wheels, f82, f82 gts, f82 wheels, gts

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