06-30-2019, 11:25 PM | #1 |
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anyone running M4 GT4 18x11 on all 4 corners?
Anyone running the M4 GT4 18x11 rims on all 4 corners? BMW uses a 25mm
spacer, but do you further need a minimum negative camber to prevent any rubbing? |
07-01-2019, 01:33 AM | #2 |
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I am, it’s a lot of work.
The entire front hub assembly is shorter/ closer to the engine as compared to the street car. I have full SPL arms, all shorter than their off the shelf offerings and my GC camber plates are maxed out. For comparison, if I put the stock front 437M wheel on the car with 30mm worth of spacers it’s almost at the same position as a stock F80. Thats the only way to get the wheel to clear, after that you just need a short tire like 295/30, or equivalent slick. I ran the 315/30 r888r for a while but don’t like the pinched feel on an 11” wheel. Alignment is normal track-like specs. ~7 caster, -3 camber, 0 toe. SAI and scrub radius are a lot higher than normal F8x cars, steering rack programming is important. |
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07-01-2019, 10:54 AM | #3 | |
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While I was researching this a while back, I found a guy with a black E90 M3 that is running it too. EDIT: Here is the thread. https://www.m3post.com/forums/showthread.php?p=23978836 I guess they piggy-backed off my original M4 GT4 wheel thread. https://f80.bimmerpost.com/forums/sh....php?t=1413212 Last edited by x.shell; 07-01-2019 at 01:50 PM.. |
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07-01-2019, 12:25 PM | #4 | |
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front track/geometry to make this work on the GT4. |
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07-03-2019, 02:09 PM | #5 |
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We do have some data on two different 18x11 fitments on the F8x chassis, as noted in our fitment guide:
For most enthusiasts, our common 18x10" ET25 front, 18x11" ET44 rear staggered fitment is most effective for both street and track duty. Pair these with 275/35-18 tires up front and 305-35-18 tires in the rear respectively and you have a great bolt-on fitment. With that said, many of our clients are serious track nuts or compete W2W on some level. Not only are they looking to maximize grip, but they would like a square fitment for a well balanced chassis with the ability to rotate wheels and tires on all four corners. In order rotate effectively, the wheel specifications needed to be cohesive from front to rear. This means that either the front or rear will need some level of "work" to properly fit an 11" square fitment. Option 1: Front & Rear: 18x11 ET44 Commonly with 295/30-18 or 305/645-18 tires The 18x11" ET44 was specifically designed for the rear of the F8X chassis, so naturally this is a direct fit out back. When we install these up front however, thick spacers are required for proper strut clearance. Breizh Motorsport's (more info) chose to go this route, and installed 25mm spacers to clear their KW Competition suspension. Keep in mind, spacer thickness will depend on the front tire brand and suspension type, as not all are created equal. An 11" ET44 wheel paired with a 25mm spacer gives us an effective offset of ET19, so this ends up being quite an aggressive fitment on the outside/fender side and a healthy amount of negative camber will be required to bring the top of the tire in under the front fenders. Since you will (should) only find this type of fitment in the hands of racers, aggressive negative camber specs are par for the course and not a limiting factor. Option 2: Front & Rear: 18x11 ET25 Commonly with 295/30-18 or 305/645-18 tires The 18x11" ET25 was specifically designed for the rear of the E9X M3, and in this scenario it is better suited for front end as the lower offset lends itself to more inner strut clearance. Naturally, this transfers the focus to the rear of the car, where the 18x11" ET25 is very aggressive (28mm more aggressive then the factory 19x10" ET40 rear wheels). In effort for these to work when the car is put through its paces on the race track, rear fender modifications will likely need to be performed in the form of "pulling/re-shaping" in combination with additional negative camber. Brett Strom from Strom Motorsports (white M4 pictured above) is well versed in this arena and no stranger to modifying factory fenders, therefore he chose to go this route. In some cases we have reports of customers using this square fitment with 305 tires without needing to modify the rear fenders, however adding -2 degrees or more of camber in the rear was still necessary. In conclusion, neither of these 11" square fitments are considered "bolt-on fitments" and should be reserved for serious track/race cars. It is important to note that regardless of which offset you choose to use, compliant track oriented suspension equipped with linear springs and a spring perch location above the front tires will be required to maximize inner clearance to the strut. - Max
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Wheels /// Accessories /// Vehicle-Specific Fitment Guides /// Careers Last edited by ApexWheels; 03-23-2021 at 06:18 PM.. |
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07-03-2019, 10:34 PM | #6 |
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The problem with the 18x10 - 275 tire combo causes a much shorter total wheel/tire diameter than the stock config and will throw off the speedo, rake, and inconsistent with the rear 18x11 -305 wheel/tire diameter. I know a bunch of people run this on the track, but if I was to consider this for the street I'm just wondering if this throws off the whole dynamics of the car.
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07-24-2019, 09:27 AM | #7 | |
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I am not looking to track the car just love the look of the wheels and they are a good bargain for the price. Planning on running a 285/35 or 295/30 tire. I plan on running the necessary camber of course. Last edited by Astro_train; 07-24-2019 at 09:28 AM.. Reason: added tire sizes |
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08-09-2019, 10:58 AM | #8 | |
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08-24-2019, 12:30 AM | #10 | |
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https://f80.bimmerpost.com/forums/sh....php?t=1413212 |
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12-10-2019, 12:05 AM | #11 |
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12-10-2019, 02:12 AM | #12 | |
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I’ve settled on running a 295/30 in front to reduce carcass bulge/squirm and prefer it over the 315/30. I’m using the civic EPS calibration currently as well. |
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01-09-2022, 04:13 PM | #13 |
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What about the correct sized studs? Im pretty sure you need long studs as the wheel hub area is stupid thick along with the spacer required.
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01-11-2022, 07:09 PM | #15 |
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Our fully forged 18" RF-GT4 wheelset is a designed to fit out of the box as it should, no mods needed, additionally with Track Desired - Knurled Beads build option!
18x9.5 ET+22 18x11 ET+44 https://www.richlandforged.com/produ...-rf-gt4-18-/18
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