[arveeezy]

Hello guys, I currently have ASA AR1 18x8 40mm offset. 225/40/18 and 255/35 in the rear. (Stock suspensions)

I'm thinking about getting 235/40/18 tires all around for my next set of tires and wanted to go for a square set up to make my tires last a little bit longer. Also where i'm from there's a million potholes every road and want more comfort while driving.

What do you guys recommend? any advice?

Thank you.

[mike-y]

I ran the same size tires all the way around on my E90 for many years. The car handles better (much more neutral), and you can rotate tires. You really shouldn't have any traction issues (unless it's raining out) as long as you have decent tires.

[arveeezy]

Originally Posted by mike-y

I ran the same size tires all the way around on my E90 for many years.

235/40/18?

do you have aftermarket strut/shocks or stock? any fitment issue if lowered in the future?

[Efthreeoh]

Below is my tire data for the 14 sets of tires I've had on my car. The data show that the most important thing for tire life is a good alignment. I run a set of tires through about every 14 months or so, so I get to see quickly how good the alignment came out. My goal is to get 35,000 miles out of a set of tires. My square setup was 235/40-18. The factory staggered is 225/40-17 and 255/35-17.

My car has the factory sport suspension with staggered 17" wheels (17x8 and 17x8.5). At the first new set of tires from the originals I swapped to a square 18" CSL replica wheel 18x8. I ran the square set up for 9 sets of tires. I rotated every 5,000 miles or there about. At 182,000 I rebuilt the suspension with new factory BMW sport shocks and associated mounting hardware and M3 thrust arms. I had an alignment done at a shop that just totally fucked the alignment. I took two other alignments, finally the last at a BMW dealer to finally get the car right. At 336,000 I replaced the suspension again with Bilstein B8 and H&R sport springs. I also replaced the front control arms and tierods. Rear suspension is 100% original except shocks. The Bilstein/H&R sits about 1/4" lower than the BMW factory sport suspension. I've had no fitment issues. IIRC the CSLs are 35MM offset. I found that rotating sided-to-side on a staggered setup vs. rotating cross pattern on a square setup is really no different.

Hope this helps.

[mike-y]

Originally Posted by arveeezy

235/40/18?

do you have aftermarket strut/shocks or stock? any fitment issue if lowered in the future?

Koni Yellow struts/shocks, on factory sport springs. No fitment issues at all. 235/40/18 is within 1.2% of the factory diameter (with new tires) or about .3 inch - not enough to notice.