M4 GT4 wheels - 18x11 ET30, 20.3lb?

[dparm]

I can see what you mean, slicer. Those teams want every advantage and they don't have the time for anxiety from questionable quality.

[slicer]

Originally Posted by Richbot

I think you're overestimating the professionalism of most GT4 drivers

Oh no, I realize most GT4 drivers are rich guys or sons of rich guys with minimal interest in the mechanical details. It's the teams that are hired to care about that

And didn't you start this thread?? Shoot I went through the trouble of buying the wheels, test fitting, determining alignment / suspension setup needs, discovering the back pad thickness, coming up with a solution... shared my findings. Stop busting my balls already

[Richbot]

lol I had that thought too - just as I finally hook somebody on the forum I'm like nah check out these other wheels

[M3MATT]

Originally Posted by slicer

GT4 Wheels are on the car! They look fantastic and fitment appears to be a success.

Unique Wheel Property -
This wheel has a back pad that is 15mm thicker than anything that I have seen. As a result, the stud required is at least 15mm longer than typical. There is no stud currently on the market that will accommodate this wheel with a 12mm spacer. BMW's own GT4 studs are designed to accommodate a 32mm spacer - yes you read that correctly - BMW is using a 32mm front spacer on the M4GT4! I am not sure why the wheel was built with that spec but my assumption is that it's due to strength requirements. As a result, we are working with MSI (leading stud manufacturer) to create a custom stud length for this wheel.

[img]https://live.staticflickr.com/65535/48537195302_a24cf0f12d_b.jpg[/img]GT4 by slicerM, on Flickr
[img]https://live.staticflickr.com/65535/48537051371_d1434afd22_b.jpg[/img]GT4 by slicerM, on Flickr
[img]https://live.staticflickr.com/65535/48537051336_4dc28e4cd6_b.jpg[/img]GT4 by slicerM, on Flickr

[img]https://live.staticflickr.com/65535/48537195182_1d8dc1e5ab_b.jpg[/img]GT4 by [...]

How much camber did you have to run up front? I have ohlins DT and am wondering if I would need a bigger or smaller spacer and trying to gauge how much camber I’d need

[M3MATT]

What camber did you run with them and 12mm front spacers? slicer

[slicer]

Originally Posted by M3MATT

What camber did you run with them and 12mm front spacers? slicer

Probably about -3.5. I honestly don't recommend these wheels unless you have someone make you custom studs. Last I checked there's nothing available off the shelf that's long enough to use them with a 12mm spacer and full thread engagement.

[M3MATT]

Originally Posted by slicer

Probably about -3.5. I honestly don't recommend these wheels unless you have someone make you a custom spacer. Last I checked there's nothing available off the shelf that's long enough to use them with a 12mm spacer and full thread engagement.

It needs to be 96mm total for the stud?

[slicer]

Originally Posted by M3MATT

It needs to be 96mm total for the stud?

addressed in post #57. Total stud length is somewhat immaterial as at could have a shorter or longer bullet head. The amount of threads is the important measure.

[GreenGoblin]

Originally Posted by slicer

3mm to 4mm plus this tire has a rim protector that protrudes 5mm. I may only need a 10mm spacer with a tire that doesn't have a rim protector

Pics:

GT4 fitment by slicerM, on Flickr
GT4 fitment by slicerM, on Flickr

Hi, Slicer where did you get the aluminum spring perch and lock collar for your clubsports? Looks like those save a ton of room over the kw plastic perches!

[slicer]

Originally Posted by GreenGoblin

Hi, Slicer where did you get the aluminum spring perch and lock collar for your clubsports? Looks like those save a ton of room over the kw plastic perches!

Those are Ohlins TTX in the picture.