Running 225/40 255/40 on xi?

ahschell · 05-22-2017, 03:10 PM

I'm about to purchase new tires and I'm currently running 225/40 front 255/35 rear on my 2008 328xi. I'm wondering if I can run 225/40 front 255/40 rear without having any issues with my all wheel drive. Any advice is appreciated!

Antetokounmpo · 05-22-2017, 04:24 PM

Quote:

Originally Posted by ahschell

I'm about to purchase new tires and I'm currently running 225/40 front 255/35 rear on my 2008 328xi. I'm wondering if I can run 225/40 front 255/40 rear without having any issues with my all wheel drive. Any advice is appreciated!

Nope nope nope.

You need to run 255/35 in the rear. There's a reason it comes with those sizes from the factory. 255/40 is way too tall to go with the fronts for xi.

ahschell · 05-22-2017, 05:12 PM

Quote:

Originally Posted by Harambe

Quote:

Originally Posted by ahschell

I'm about to purchase new tires and I'm currently running 225/40 front 255/35 rear on my 2008 328xi. I'm wondering if I can run 225/40 front 255/40 rear without having any issues with my all wheel drive. Any advice is appreciated!

Nope nope nope.

You need to run 255/35 in the rear. There's a reason it comes with those sizes from the factory. 255/40 is way too tall to go with the fronts for xi.

Forgot to mention I'm on 18s.

My next question is how are forum members running square setups with xi? (ex 235/40/18) where as im wanting to run a square profile but staggered width (225/40/18 front 255/40/18 rear)

Antetokounmpo · 05-22-2017, 05:21 PM

Quote:

Originally Posted by ahschell

Forgot to mention I'm on 18s.

My next question is how are forum members running square setups with xi? (ex 235/40/18) where as in wanting to run a square profile but staggered width (225/40/18 front 255/40/18 rear)

I assumed 18s based off those sizes.

Why would you want 'square' profile? 225/40/18 and 255/35/18 have the nearly the same sidewall sizes. The sidewall size is a direct correlation with the tire width.

(225*.4*2)/25.4 = 7.08in of total sidewall

(255*.35*2)/25.4 = 7.03in of total sidewall

(255*.4*2)25.4 = 8.03in of total sidewall

A square setup is the same width front and rear. I run 255/35/18 on all 4.

ahschell · 05-22-2017, 05:30 PM

Quote:

Originally Posted by Harambe

I assumed 18s based off those sizes.

Why would you want 'square' profile? 225/40/18 and 255/35/18 have the nearly the same sidewall sizes. The sidewall size is a direct correlation with the tire width.

(225*.4*2)/25.4 = 7.08in of total sidewall

(255*.35*2)/25.4 = 7.03in of total sidewall

(255*.4*2)25.4 = 8.03in of total sidewall

A square setup is the same width front and rear. I run 255/35/18 on all 4.

Ahh yes that makes sense thank you for the clarification! Looks like I'll be sticking with my original setup

Cheers

rgarrett97 · 05-24-2017, 08:56 PM

Quote:

Originally Posted by Harambe

I assumed 18s based off those sizes.

Why would you want 'square' profile? 225/40/18 and 255/35/18 have the nearly the same sidewall sizes. The sidewall size is a direct correlation with the tire width.

(225*.4*2)/25.4 = 7.08in of total sidewall

(255*.35*2)/25.4 = 7.03in of total sidewall

(255*.4*2)25.4 = 8.03in of total sidewall

A square setup is the same width front and rear. I run 255/35/18 on all 4.

What model are you running 255/35/18 on? What are your rim size and offset? Did you have to do anything to prevent them from rubbing?

Antetokounmpo · 05-25-2017, 08:04 AM

Quote:

Originally Posted by rgarrett97

What model are you running 255/35/18 on? What are your rim size and offset? Did you have to do anything to prevent them from rubbing?

Pre lci E90.

18x8.5 et23, lowered on bilstein b12. Never had any issues with rubbing.

ahschell · 05-25-2017, 09:48 AM

Quote:

Originally Posted by rgarrett97

What model are you running 255/35/18 on? What are your rim size and offset? Did you have to do anything to prevent them from rubbing?

I am pre-lci as well with eibach pro kit springs and bilstein sport shocks. I'm at 38 front 40 rear but am running 12mm spacers in the front and 18mm rear with no issues at all

racermp · 05-25-2017, 12:01 PM

https://www.tacomaworld.com/tirecalc...0r18-255-40r18

Hearf · 05-25-2017, 06:33 PM

Quote:

Originally Posted by rgarrett97

What model are you running 255/35/18 on? What are your rim size and offset? Did you have to do anything to prevent them from rubbing?

I have an LCI E90 335xi and I can run 255/35/18's on a mild drop with no rubbing and no spacers. Running square Apex Arc-8's (18x9 et30).

drmdvl · 06-07-2017, 09:57 PM

The only time I run a square setup (235/40 18) is in the winter so my front and rear tread width are the same - really makes for a stable ride in snow.

You can do F 235/40 and R 265/35 if you want wider tires and a bit more fill in the fender gap on the xi, otherwise stick to the stock size.

05-22-2017, 03:10 PM	#1
ahschell Private 14 Rep 83 Posts Drives: 2008 328xi Join Date: Jan 2013 Location: KS iTrader: (0) Garage List 2008 BMW 328xi [5.50]	Running 225/40 255/40 on xi? I'm about to purchase new tires and I'm currently running 225/40 front 255/35 rear on my 2008 328xi. I'm wondering if I can run 225/40 front 255/40 rear without having any issues with my all wheel drive. Any advice is appreciated!
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05-25-2017, 12:01 PM	#9
racermp Major 190 Rep 937 Posts Drives: F30 330i Join Date: Apr 2013 Location: Houston, TX iTrader: (1)	https://www.tacomaworld.com/tirecalc...0r18-255-40r18
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06-07-2017, 09:57 PM	#11
drmdvl Second Lieutenant 57 Rep 271 Posts Drives: 2015 X5 50i, 2015 Macan Turbo Join Date: Jul 2011 Location: Northern CO iTrader: (0) Garage List 2020 BMW X5 M50i [0.00] 2017 BMW i3 REX [0.00] 2015 Porsche Macan ... [0.00]	The only time I run a square setup (235/40 18) is in the winter so my front and rear tread width are the same - really makes for a stable ride in snow. You can do F 235/40 and R 265/35 if you want wider tires and a bit more fill in the fender gap on the xi, otherwise stick to the stock size.
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