18x11 ET30 Front Wheel Fitment

Race82 · 01-13-2018, 08:55 AM

I've seen a few track F8X and the M4 GT4 running this set up with 305/660-18 slicks - what's actually required to run/fit this set up? Would love to know size of spacers F&R and any other modifications or guard adjustments/inner wheel mods required? Running Bilsten ClubSports 2 Way.

F3IGHTY · 01-13-2018, 09:02 AM

The GT4 runs a huge spacer up front (~25mm) and a lot of camber. Bimmerworld also cautions that the front suspension geometry is different from the road car which could make that setup more difficult to emulate.

Keep in mind that almost all coilover perches reduce the available inner clearance compared to the OEM assembly. Changing up the spring length, perch placement, etc to get those parts above the shoulder of the tire will help a lot.

With the 11" front you'll need somewhere around a +10 to +15 offset depending on inner clearance, outer clearance isn't too bad once you start dialing in camber. The tire you decide to run plays a huge roll in this since it's what would actually interfere. A stretched 285 or 295 street tire would be much easier than a chunky 305 r-comp.

Race82 · 01-13-2018, 09:26 PM

Quote:

Originally Posted by F3IGHTY

The GT4 runs a huge spacer up front (~25mm) and a lot of camber. Bimmerworld also cautions that the front suspension geometry is different from the road car which could make that setup more difficult to emulate.

Keep in mind that almost all coilover perches reduce the available inner clearance compared to the OEM assembly. Changing up the spring length, perch placement, etc to get those parts above the shoulder of the tire will help a lot.

With the 11" front you'll need somewhere around a +10 to +15 offset depending on inner clearance, outer clearance isn't too bad once you start dialing in camber. The tire you decide to run plays a huge roll in this since it's what would actually interfere. A stretched 285 or 295 street tire would be much easier than a chunky 305 r-comp.

25mm spacer is huge, what kind of camber must they be running -3?

F3IGHTY · 01-13-2018, 09:41 PM

Or more

bracer · 01-13-2018, 10:25 PM

I would say 18x11 with a 12mm offset. -3.5 camber. Also note most are using 305/645/18. You need the short tire to fit. Something with a 6' spring and no helper to fit that btw (or stock)

F3IGHTY · 01-14-2018, 11:30 AM

Quote:

Originally Posted by blackey

I would say 18x11 with a 12mm offset. -3.5 camber. Also note most are using 305/645/18. You need the short tire to fit. Something with a 6' spring and no helper to fit that btw (or stock)

You going to try it? Im so close to ordering the GT4 set lol

bracer · 01-14-2018, 05:23 PM

I'm actually going to try an 19x10.5 with a 305/30/19 RE-71R. I think I can get it to fit with a little massaging of the fender liners.

Vectors2final · 01-14-2018, 05:41 PM

EDIT:

Reading Comprehension>me

Signature Wheel BMW · 01-15-2018, 09:27 AM

M4 GT4 has very bespoke suspension.

18x11 ET30 isn't going to clear Bilstein Clubsport Spring Perch. If you had just lowering spring, then you can do 18x11 ET12 with -3.5 camber. Still an issue to clear the fenders if you have 305.

I do not recommend tracking with slicks on 15-18mm spacers.

What benefit are you trying to achieve with 305 front? 275 front already significantly solve understeer, you can squeeze 285 with slight rubbing for even a better improvement.

Your suspension setup, I would do 18x10 ET16 front and 18x11.5 ET42 rear. Assume -3 front and -2 rear camber. 275/305 setup.

Race82 · 01-18-2018, 07:10 AM

Quote:

Originally Posted by Signature Wheel BMW

M4 GT4 has very bespoke suspension.

18x11 ET30 isn't going to clear Bilstein Clubsport Spring Perch. If you had just lowering spring, then you can do 18x11 ET12 with -3.5 camber. Still an issue to clear the fenders if you have 305.

I do not recommend tracking with slicks on 15-18mm spacers.

What benefit are you trying to achieve with 305 front? 275 front already significantly solve understeer, you can squeeze 285 with slight rubbing for even a better improvement.

Your suspension setup, I would do 18x10 ET16 front and 18x11.5 ET42 rear. Assume -3 front and -2 rear camber. 275/305 setup.

Thanks, good info, what actual slick combo would u pair with this combo - preferably with zero rubbing

Signature Wheel BMW · 01-18-2018, 08:27 AM

Quote:

Originally Posted by awbmw

Thanks, good info, what actual slick combo would u pair with this combo - preferably with zero rubbing

If slicks 305, I would do 19x11 ET44 rear to be safe. Wider tires will be very problematic. I think we're talking via email by the way.

bracer · 01-18-2018, 09:52 AM

That's what I run. 18x10 and 18x11 with 305/645/18 Pirelli DH slicks all around. This works well and doesn't rub. 18x10.5 would be better, but that's what was available.

275/305 will push fyi. It's very hard to make it not to. 20mm tire stagger is about the limit I think trying to keep it neutral.

Agreed on the ET44 rear.
I also have a set of the Signature Wheels and they are great!

Race82 · 01-21-2018, 02:55 AM

Quote:

Originally Posted by blackey

That's what I run. 18x10 and 18x11 with 305/645/18 Pirelli DH slicks all around. This works well and doesn't rub. 18x10.5 would be better, but that's what was available.

275/305 will push fyi. It's very hard to make it not to. 20mm tire stagger is about the limit I think trying to keep it neutral.

Agreed on the ET44 rear.
I also have a set of the Signature Wheels and they are great!

What ET are you running on the 18x10 or using spacers? 305 is a big tire to fit on a 10" wheel as well...

Also when you say will push, what are you referring to?

Race82 · 01-21-2018, 02:57 AM

Quote:

Originally Posted by Signature Wheel BMW

If slicks 305, I would do 19x11 ET44 rear to be safe. Wider tires will be very problematic. I think we're talking via email by the way.

We sure are - and i already have a set of your wheels

bracer · 01-21-2018, 10:10 AM

Slicks seem to allow for a wider tire range than a standard tire I've found. The Pirelli slicks run quite small as well, so they seem to work well that way.

With a 275/305 by push I mean the front end loses traction first. For 18x10 ET25 works depending on suspension. On the rear the 18x11 ET44 is perfect.

Race82 · 01-31-2018, 03:58 AM

Quote:

Originally Posted by blackey

Slicks seem to allow for a wider tire range than a standard tire I've found. The Pirelli slicks run quite small as well, so they seem to work well that way.

With a 275/305 by push I mean the front end loses traction first. For 18x10 ET25 works depending on suspension. On the rear the 18x11 ET44 is perfect.

Very cool - any pics blackey?

If you could choose the perfect Rim & ET size for front, to run the same 305/645 DH Slick, would it be 18x10.5 ET15??

Interested why you went for a 305 square instead of a 295 or 285 up front?

bracer · 02-01-2018, 08:11 AM

19x10.5 ET 22 (with 305/30/19 up front) I have as well and those work great, so probably 18x10.5 ET20 would fit well. (smaller the rim the less clearance due to the suspension design).

I started with 285/645/18 and 305/645/18. The 285 and 305 look almost identical, and were harder to find. Running the same tire all around has advantages from a swapping standpoint.

I see two options. 18x10.5 ET 20 / 18x11 ET 44 or 18x10.5 ET 38 for all four.

That will give the same offset on the rear with a bit more clearance on the inside of the wheels. On the front you could run a 20mm spacer like the M4 GT4 and be ok. You could then rotate tires front / rear etc... Just depends if you are comfortable with a big spacer like that up front.

M3SQRD · 02-23-2018, 09:26 PM

Quote:

Originally Posted by blackey

19x10.5 ET 22 (with 305/30/19 up front) I have as well and those work great, so probably 18x10.5 ET20 would fit well. (smaller the rim the less clearance due to the suspension design).

I started with 285/645/18 and 305/645/18. The 285 and 305 look almost identical, and were harder to find. Running the same tire all around has advantages from a swapping standpoint.

I see two options. 18x10.5 ET 20 / 18x11 ET 44 or 18x10.5 ET 38 for all four.

That will give the same offset on the rear with a bit more clearance on the inside of the wheels. On the front you could run a 20mm spacer like the M4 GT4 and be ok. You could then rotate tires front / rear etc... Just depends if you are comfortable with a big spacer like that up front.

I know you know this but...Professional race teams routinely use 20+ mm spacers and, as already stated, the M4 GT4 comes with a huge spacer from the factory. You'll be fine as long as the correct length lugs (i.e., same thread engagement as stock lugs) are used with a spacer.

hatepotholez · 02-23-2018, 09:57 PM

@ctgeorge

jacobe92 · 02-24-2018, 08:03 AM

+1 for the rear, 18x11 et 43 with 305/35/18 works with zero issues.

Race82 · 02-25-2018, 04:49 AM

Quote:

Originally Posted by jacobe92

+1 for the rear, 18x11 et 43 with 305/35/18 works with zero issues.

Nice, what are u running up front?

Astro_train · 07-24-2019, 10:12 AM

Quote:

Originally Posted by Signature Wheel BMW

M4 GT4 has very bespoke suspension.

18x11 ET30 isn't going to clear Bilstein Clubsport Spring Perch. If you had just lowering spring, then you can do 18x11 ET12 with -3.5 camber. Still an issue to clear the fenders if you have 305.

I do not recommend tracking with slicks on 15-18mm spacers.

What benefit are you trying to achieve with 305 front? 275 front already significantly solve understeer, you can squeeze 285 with slight rubbing for even a better improvement.

Your suspension setup, I would do 18x10 ET16 front and 18x11.5 ET42 rear. Assume -3 front and -2 rear camber. 275/305 setup.

given what you mentioned here, would the stock shocks with KW HAS KIT work better with the 18x11 GT4 wheel? I am still trying to confirm what size of spacer is required for a car running standard M3/4 brakes. Given this, would you say a 285/35 all around work with a the camber you suggested?

doing some preliminary research on these wheels so I came across this thread since only one other person is running this on their M4 but their vehicle is a track car. Not tracking mine, just like the look of the wheels and seeing if this is even possible without a ton of work. I definitely do not want to venture into fender rolling or anything like that.

01-13-2018, 08:55 AM	#1
Race82 Second Lieutenant 75 Rep 233 Posts Drives: M4 Join Date: Jun 2014 Location: Australia iTrader: (0)	18x11 ET30 Front Wheel Fitment I've seen a few track F8X and the M4 GT4 running this set up with 305/660-18 slicks - what's actually required to run/fit this set up? Would love to know size of spacers F&R and any other modifications or guard adjustments/inner wheel mods required? Running Bilsten ClubSports 2 Way.
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01-13-2018, 09:02 AM	#2
F3IGHTY Lieutenant 210 Rep 400 Posts Drives: M3 Join Date: Aug 2016 Location: Bay Area iTrader: (3)	The GT4 runs a huge spacer up front (~25mm) and a lot of camber. Bimmerworld also cautions that the front suspension geometry is different from the road car which could make that setup more difficult to emulate. Keep in mind that almost all coilover perches reduce the available inner clearance compared to the OEM assembly. Changing up the spring length, perch placement, etc to get those parts above the shoulder of the tire will help a lot. With the 11" front you'll need somewhere around a +10 to +15 offset depending on inner clearance, outer clearance isn't too bad once you start dialing in camber. The tire you decide to run plays a huge roll in this since it's what would actually interfere. A stretched 285 or 295 street tire would be much easier than a chunky 305 r-comp. Last edited by F3IGHTY; 01-13-2018 at 09:09 AM..
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01-13-2018, 09:41 PM	#4
F3IGHTY Lieutenant 210 Rep 400 Posts Drives: M3 Join Date: Aug 2016 Location: Bay Area iTrader: (3)	Or more
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01-13-2018, 10:25 PM	#5
bracer Mr Bill 296 Rep 545 Posts Drives: GLC63 Join Date: Sep 2013 Location: Aliso Viejo iTrader: (1)	I would say 18x11 with a 12mm offset. -3.5 camber. Also note most are using 305/645/18. You need the short tire to fit. Something with a 6' spring and no helper to fit that btw (or stock)
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01-14-2018, 05:23 PM	#7
bracer Mr Bill 296 Rep 545 Posts Drives: GLC63 Join Date: Sep 2013 Location: Aliso Viejo iTrader: (1)	I'm actually going to try an 19x10.5 with a 305/30/19 RE-71R. I think I can get it to fit with a little massaging of the fender liners.
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01-14-2018, 05:41 PM	#8
Vectors2final Brigadier General 1349 Rep 3,345 Posts Drives: 2018 F80 YMB/SS ZCP Join Date: May 2011 Location: Austin, Tx iTrader: (0)	EDIT: Reading Comprehension>me __________________ 2019 Ruby GT350 - Gen 5 Whipple on corn making 855RWHP. Sold: 2018 F80 Part Deux /DCT /YMB /Full SS /CF Trim /ZCP /ZEC w/Black 666M Sold: 2015 F80 /DCT /YMB /Full SS /CF Trim /ZEC /ZLP /HK /S&TVC- 18''///M
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01-15-2018, 09:27 AM	#9
Signature Wheel BMW Major 1103 Rep 1,083 Posts Drives: Signature BMW Join Date: Sep 2016 Location: IG: signature_bmw iTrader: (0)	M4 GT4 has very bespoke suspension. 18x11 ET30 isn't going to clear Bilstein Clubsport Spring Perch. If you had just lowering spring, then you can do 18x11 ET12 with -3.5 camber. Still an issue to clear the fenders if you have 305. I do not recommend tracking with slicks on 15-18mm spacers. What benefit are you trying to achieve with 305 front? 275 front already significantly solve understeer, you can squeeze 285 with slight rubbing for even a better improvement. Your suspension setup, I would do 18x10 ET16 front and 18x11.5 ET42 rear. Assume -3 front and -2 rear camber. 275/305 setup. __________________ Jimmy \| BMW Addict \| Signature Performance Wheels \| OBSESSED WITH PERFECTION \| IG: Signature_BMW \| Email: jimmy@signaturewheel.com
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01-18-2018, 09:52 AM	#12
bracer Mr Bill 296 Rep 545 Posts Drives: GLC63 Join Date: Sep 2013 Location: Aliso Viejo iTrader: (1)	That's what I run. 18x10 and 18x11 with 305/645/18 Pirelli DH slicks all around. This works well and doesn't rub. 18x10.5 would be better, but that's what was available. 275/305 will push fyi. It's very hard to make it not to. 20mm tire stagger is about the limit I think trying to keep it neutral. Agreed on the ET44 rear. I also have a set of the Signature Wheels and they are great!
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01-21-2018, 10:10 AM	#15
bracer Mr Bill 296 Rep 545 Posts Drives: GLC63 Join Date: Sep 2013 Location: Aliso Viejo iTrader: (1)	Slicks seem to allow for a wider tire range than a standard tire I've found. The Pirelli slicks run quite small as well, so they seem to work well that way. With a 275/305 by push I mean the front end loses traction first. For 18x10 ET25 works depending on suspension. On the rear the 18x11 ET44 is perfect.
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02-01-2018, 08:11 AM	#17
bracer Mr Bill 296 Rep 545 Posts Drives: GLC63 Join Date: Sep 2013 Location: Aliso Viejo iTrader: (1)	19x10.5 ET 22 (with 305/30/19 up front) I have as well and those work great, so probably 18x10.5 ET20 would fit well. (smaller the rim the less clearance due to the suspension design). I started with 285/645/18 and 305/645/18. The 285 and 305 look almost identical, and were harder to find. Running the same tire all around has advantages from a swapping standpoint. I see two options. 18x10.5 ET 20 / 18x11 ET 44 or 18x10.5 ET 38 for all four. That will give the same offset on the rear with a bit more clearance on the inside of the wheels. On the front you could run a 20mm spacer like the M4 GT4 and be ok. You could then rotate tires front / rear etc... Just depends if you are comfortable with a big spacer like that up front.
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02-23-2018, 09:57 PM	#19
hatepotholez Major 293 Rep 1,015 Posts Drives: M3 Join Date: Mar 2011 Location: NYC, NY iTrader: (1)	@ctgeorge
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02-24-2018, 08:03 AM	#20
jacobe92 Major 619 Rep 1,239 Posts Drives: 2016 Hell Rot F80 M3 Join Date: Aug 2010 Location: California iTrader: (6)	+1 for the rear, 18x11 et 43 with 305/35/18 works with zero issues. Attached Images __________________ 2016 Hellrot F80 M3\|JRZ RS Pro with Swift Springs 550/750 spring rates l AP Radical 5000R 9668/9449 lSpiegler SS LinesI DS1.11I Eisenmann DP\|MPE Catback\|18" Forgeline GS1R 18x10 et 22 and 18x11 et 44 NT01 275/35/18 and 305/35/18\| Forgeline GTD1 18x10et43 SquarelM Performance Lip/Splitter\|IND aesthetic mods\|Dinan Toe Link\|Fall Line mono ball conversion kit and upper link kit\| Aim Solo 2DL Smarty Cam\|Simpson Hybrid\|Stilo Offshore helmet.
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