245/40/R18 vs 255/35/R18 tires

mvzarrelli · 05-30-2023, 02:44 PM

I ordered a set of Apex Arc 8s in 18x9 ET30 for my E90 328i Xdrive. I’m going for a square setup on stock suspension but am unsure what tire size to get. I don’t mind using spacers. I’m wondering if the turn in will feel slower on 255s. Anybody run these setups and have some feedback?
Thanks.

tcphoto · 05-30-2023, 04:22 PM

I'd look seriously at 235/40/18, the 245 and 255 are just too large on the front of an E90. Isn't ET30 about 5mm too aggressive on the car also?

jwalther · 05-31-2023, 06:28 AM

18 x 9 square with 245/40 is my exact setup.

mattanderson · 05-31-2023, 04:49 PM

255's are doable up front with negative camber.

They might be a bit pokey if you're on 100% stock suspension + camber.

whyzee125 · 06-01-2023, 06:56 PM

I have 18x9 et30 front with 255/35r18. Pretty common setup even with stock suspension. I'd do that, the 245/40's look a bit beefy which I don't care for (although some do).

It will depend a bit on the tire brand too. I run Conti DWS and they're kind of rounded, I have a ton of clearance. With the Michelins I had before I could get it to rub ever so slightly on that bumper bracket but it was never an issue at all.

05-30-2023, 02:44 PM	#1
mvzarrelli Registered 0 Rep 3 Posts Drives: BMW 328i Xdrive Join Date: Feb 2022 Location: Bethlehem, PA iTrader: (0) Garage List 2011 BMW [0.00]	245/40/R18 vs 255/35/R18 tires I ordered a set of Apex Arc 8s in 18x9 ET30 for my E90 328i Xdrive. I’m going for a square setup on stock suspension but am unsure what tire size to get. I don’t mind using spacers. I’m wondering if the turn in will feel slower on 255s. Anybody run these setups and have some feedback? Thanks.
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05-30-2023, 04:22 PM	#2
tcphoto Brigadier General 4203 Rep 3,253 Posts Drives: E92 335i 6MT Coupe Join Date: Dec 2009 Location: Nashville, TN iTrader: (1)	I'd look seriously at 235/40/18, the 245 and 255 are just too large on the front of an E90. Isn't ET30 about 5mm too aggressive on the car also? __________________
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05-31-2023, 06:28 AM	#3
jwalther Private 113 Rep 51 Posts Drives: 2011 E91 Join Date: Jun 2019 Location: Lexington, KY iTrader: (0)	18 x 9 square with 245/40 is my exact setup. __________________ 2011 E91 328xi N52, Black Sapphire Metallic/Dakota Chestnut; 3 Stage Manifold, AFE Headers and Intake; Stage FP Tune; BMW Performance Exhaust
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05-31-2023, 04:49 PM	#4
mattanderson Second Lieutenant 286 Rep 233 Posts Drives: 2007 E92 328i Join Date: Mar 2023 Location: San Diego iTrader: (0)	255's are doable up front with negative camber. They might be a bit pokey if you're on 100% stock suspension + camber.
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06-01-2023, 06:56 PM	#5
whyzee125 Brigadier General 1997 Rep 4,028 Posts Drives: Dinan stage 2 335i Join Date: Jul 2014 Location: Chattanooga Tn iTrader: (0)	I have 18x9 et30 front with 255/35r18. Pretty common setup even with stock suspension. I'd do that, the 245/40's look a bit beefy which I don't care for (although some do). It will depend a bit on the tire brand too. I run Conti DWS and they're kind of rounded, I have a ton of clearance. With the Michelins I had before I could get it to rub ever so slightly on that bumper bracket but it was never an issue at all.
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