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[f82_spooly]

What is the most AGGRESSIVE/Concave specs for a 335i RWD coupe that I could run with a Apex Arc 8? 18x9.5 and 18x10.5? I'd also like to run either a 255/265/275 tire in the rear would it fit? My quarter panels and fenders are rolled and I'd like a staggered set up. . What specs would you guys recommend?

[biz77]

I would start here:
https://support.apexraceparts.com/hc...-Fitment-Guide
and focus on this part:
Front: 18x9" ET30 or ET31 with 245/40-18 tires
Rear: 18x10" ET33 with 275/35-18 tires
Popular fitment
255/35-18 front tires can also be used as a direct fit.
If using ARC-8 design, 18x9.5" ET35 rear wheels may be used.
5mm front spacers may be required with certain aftermarket suspensions, see below.
Rolled rear fenders may be required to prevent rubbing depending on ride height.
LCI sedan and wagon will require rolled rear fenders and/or negative camber to prevent rubbing. 265/35-18 rear tires will also help to reduce the likelihood of rubbing.

All ARC 8 sub ET40 offsets in 9", 9.5" and 10" widths have the same face profile or concavity.

[DCook]

Ive ran 18x10 et25 arc 8s on a 265/35 federal 595. Also ran them up front with a 225/40. Rear camber was at like -2.5 or so iirc on h&r race springs.

View post on imgur.com

Front fenders were broken from a 265 tire, the pics are a 235. After the 225s never had an issue.

[philgli]

i have a square setup so cannot help with staggered but i run the profile 3 arc8 in 18x9 ET30 all the way around. I have 255s in the front on ST coilovers with no spacer. i can almost promise you cant fit a wider tire. my tire has about 2 sheets of paper width from my coilover. Also, i could maybe add a 5 mil spacer but i have already cracked 2 fenders...

[ApexWheels]

We greatly appreciate your interest OP. To ensure we are on the same page with fitment recommendations, can you answer the following questions?

• Do you have aftermarket suspension and/or adjustable camber plates?
  
• How do you plan to use the car? Is it strictly a street car, or will it see track time?

As others have mentioned, all ARC-8 wheels with a profile 3 face have the same deep concavity regardless of the wheel width (see below). A staggered setup that features front and rear wheels with a profile 3 deep concave face is relatively easy to achieve on this chassis, so it really just comes down to how wide of a wheel you need to support your desired tire sizes and how flush you would like the stance.




18x8.5" ET45 - Profile 1 shallow concavity
18x8.5" ET38 - Profile 1 shallow concavity
18x9" ET42 - Profile 1 shallow concavity
18x9" ET30 - Profile 3 deep concavity
18x9.5" ET58 - Profile 1 shallow concavity
18x9.5" ET35 - Profile 3 deep concavity
18x9.5" ET22 - Profile 3 deep concavity
18x10" ET25 - Profile 3 deep concavity
18x10.5" ET27 - Profile 3 deep concavity

The most popular 18" ARC-8 staggered fitment featuring the profile 3 deep concave face front and rear would be as follows:

Front: 18x9" ET30
Rear: 18x9.5" ET35

With these wheel widths, the most common/appropriate tire sizes would be 255/35-18 front and 265/35-18 rear. Although the front could benefit from a touch of negative camber for extra fender clearance, many enthusiasts run this as a bolt-on fitment without performing any modifications to the car. It looks great and performs very well. In the rear, the 18x9.5" ET35 has a high enough offset to accommodate 275/35-18 tires with little to no work, however, vehicle ride height, tire brand, and alignment settings will ultimately dictate whether additional negative or fender rolling is required to prevent rubbing.

If a customer wants a more aggressive rear fitment, the folloeing two staggered fitments are feasible:

Front: 18x9" ET30
Rear: 18x9.5" ET22

Front: 18x9" ET30
Rear: 18x10" ET25

As previously mentioned, all three rear wheel options in consideration here will have the same profile 3 concave face, so this decision really comes down to wheel width and the stance you are trying to achieve. The 18x9.5" ET22 is obviously the same width as the 18x9.5" ET35, however, the wheel will be positioned 13mm closer to the rear fenders for a more flush/aggressive fitment. With 275/35-18 installed, negative camber and/or rear fender rolling is typically required. The 18x10" ET25 is 1/2" wider, therefore it would result in superior sidewall support for 275/35-18 tires. In comparison to the 18x9.5" ET35, the 10" wheels would sit 16mm closer to the rear fenders (only 3mm more aggressive than the 18x9.5" ET22), and would also require negative camber and/or fender rolling to prevent rubbing.


- Ryan