18x10 ET25 - 275/35/18

S2000 · 05-17-2025, 09:16 AM

Been using 18x10 ET25, 275/35/18 for both street and track.
Front with 10mm spacer
Rear no spacer

Is this still the most popular street and track setup?

M3SQRD · 05-18-2025, 01:17 AM

Yes and no. If you’ve owned the car while it was still in production, a lot of people still run the 18x10et25 and 275/35 (different spacer thicknesses and 285/35 or 285/30). If not, people are now running 18x10.5et22 or et27 with 295 tires (and different spacer thicknesses).

aus · 05-20-2025, 01:06 AM

But will the 10.5 with 295 tires fit in the back seat??
.

bigjae1976 · 07-08-2025, 10:12 AM

10mm spacer in front or back? If you run a square setup, the front track width gets wider relative to the rear axle.

You will want a 12mm spacer in the rear to maintain the track width.

M3.Delight · 08-22-2025, 02:41 PM

It’s popular due to readly available 275/35 tire size. I personally have been running square setup for awhile now due to the fact that I can rotate tires. You definitely want to consider rear spacers as well. I run 5mm up front and 10mm rear. I also run a wing to make the rear planted since it’s a square setup.

05-17-2025, 09:16 AM	#1
S2000 Private First Class 26 Rep 101 Posts Drives: E86 Z4M/E60 M5/E92 M3/F80 M3 Join Date: Dec 2008 Location: Austin TX iTrader: (1)	18x10 ET25 - 275/35/18 - Street and Track Been using 18x10 ET25, 275/35/18 for both street and track. Front with 10mm spacer Rear no spacer Is this still the most popular street and track setup?
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05-18-2025, 01:17 AM	#2
M3SQRD Major General 7890 Rep 9,855 Posts Drives: 330G20,240F22,M3E92,F82,MCSR56 Join Date: Jun 2009 Location: Mid-Atlantic iTrader: (12)	Yes and no. If you’ve owned the car while it was still in production, a lot of people still run the 18x10et25 and 275/35 (different spacer thicknesses and 285/35 or 285/30). If not, people are now running 18x10.5et22 or et27 with 295 tires (and different spacer thicknesses).
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05-20-2025, 01:06 AM	#3
aus Major General 1009 Rep 9,088 Posts Drives: Odysse Join Date: Jul 2005 Location: Seal Beach, CA iTrader: (10)	But will the 10.5 with 295 tires fit in the back seat?? . __________________ Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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07-08-2025, 10:12 AM	#4
bigjae1976 Major General 1974 Rep 8,239 Posts Drives: 11 E90 M3 Individual Join Date: Mar 2006 Location: Houston, TX iTrader: (22) Garage List 2004 BMW M3 [6.33] 2011 BMW E90 M3 [6.83] 2013 BMW 328i [6.67]	10mm spacer in front or back? If you run a square setup, the front track width gets wider relative to the rear axle. You will want a 12mm spacer in the rear to maintain the track width. __________________ 2018 F30 320iX Melbourne Red 2011 E90 M3 Monte Carlo Blue 2004 E46 M3 Imola Red 2000 E36/7 Z3 Steel Blue
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08-22-2025, 02:41 PM	#5
M3.Delight Private First Class 151 Rep 188 Posts Drives: 09 E92 M3 Join Date: Mar 2019 Location: 714,604 iTrader: (1)	It’s popular due to readly available 275/35 tire size. I personally have been running square setup for awhile now due to the fact that I can rotate tires. You definitely want to consider rear spacers as well. I run 5mm up front and 10mm rear. I also run a wing to make the rear planted since it’s a square setup.
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