after all these years this post is so useful to me now
Quote:
Originally Posted by ApexRaceParts
I will continue to build out this post with more extensive notes on each fitment, but here is a quick reference guide to proven E9X M3 fitments with their respective tire sizes.
Recommended Staggered Fitments
F: 18x9" ET30/31 - 240/40-18 or 255/35-18
R: 18x10" ET25 - 275/35-18
^ This staggered fitment is 1/2" wider than the OEM 219/220 M wheels, mirroring the M3 ZCP/GTS wheel widths and offsets. This is a direct bolt on solution with no modifications required.
F: 18x9.5" ET22 - 265/35-18
R: 18x10.5 ET27/22 - 285/35-18
^ This is our most popular staggered fitment, used amongst performance street and weekend track warriors alike. This configuration is 1" wider in comparison to the standard 219/220 M wheels, and grip is substantially increased without going overboard on tire widths. This is a bolt on solution with no modifications required, and perfect for E9X M3's that have remained naturally aspirated.
F: 18x10" ET25 - 275/35-18
R: 18x11" ET25 - 295/35-18
^ This is another popular staggered fitment that is just a touch more aggressive than the fitment above. These wheel widths are about as wide as the front and rear fenders will take without extensive modifications. For enthusiasts looking for a little more tire, this is typically a bolt on fitment with no modifications required. For staggered fitments, we typically do not recommend exceeding a 295 tire in the rear unless the car has a substantial bump in power (supercharged / stroker) as anything wider will likely be counter productive.
The front tires may lightly scrub the inner fender liners at full lock or at particular steering angles, and most of the time things will "self clear" over time (a little divot will form in the plastic liner). This is considered par for the course with wider wheels and tires, and enthusiasts shouldn't worry as no major damage will come from this.
* Please note, aftermarket suspensions that are known for reducing clearance in relation to the front wheels and tires will require 5mm spacers with the 10" ET25 front wheels. Examples are KW HAS, KW Variants, KW Clubsports and Ohlins R&T.
F: 18x10" ET25 - 275/35-18
R: 18x11" ET44 - 305/35-18
* 12mm spacers in the rear
^ This is the most aggressive staggered fitment out of the lineup, and would typically be reserved for either a serious track/race car or a car with a substantial bump in power (supercharged / stroker). The drivers goal is to maximize wheel and tire width under the front and rear fenders, and some planning to install slicks may even opt for a 10.5" front wheel for superior sidewall support. When running 305 tires out back (especially for r-comps and slicks), the 18x11" ET44 is recommended with 12mm spacers, giving us an effective offset of ET32. The higher offset in comparison to the 18x11" ET25 is advantageous for clearance purposes.
The front tires may lightly scrub the inner fender liners at full lock or at particular steering angles, and most of the time things will "self clear" over time (a little divot will form in the plastic liner). This is considered par for the course with wider wheels and tires, and enthusiasts shouldn't worry as no major damage will come from this.
* Please note, aftermarket suspensions that are known for reducing clearance in relation to the front wheels and tires will require 5mm spacers with the 10" ET25 front wheels. Examples are KW HAS, KW Variants, KW Clubsports and Ohlins R&T.
Recommended Square Fitments
F&R: 18x9.5" ET22 - 265/35-18 or 275/35-18
F&R: 18x10" ET25 - 275/35-18
F&R: 18x10.5" ET22 - 275/35-18 or 295/30-18
- Ryan
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