Tire size question

newport325i · 08-17-2009, 09:37 PM

I am running goodear eagle f1s on my 2006 325 sport with 18" 162s - staggered set up: 225/40/18 front & 255/35/18 rear.

the roads in new england suck at best and as a result i have major bubbles on the sidewall of one of my rear tires - not good.

long story short i am replacing all 4 with Kumho Ecsta ASX and I'd like a bit more protection than I have now.

Can I run 255/45ZR18 on the rears and 225/45ZR18 on the front without rubbing or any other bad stuff?

VMRWheels · 08-18-2009, 02:10 AM

Those sizes are going to be tall and will throw off your speedo as well as cause some rubbing issues during compression or full cabin. I would recommend sticking with the previous setup of 225/40/18 and 255/35/18.

-Charles@VMRWheels

newport325i · 08-18-2009, 06:58 AM

got it - thanks for your help - much appreciated!

VMRWheels · 08-18-2009, 02:54 PM

Quote:

Originally Posted by newport325i

got it - thanks for your help - much appreciated!

No problem!

-Charles@VMRWheels

meyergru · 08-19-2009, 05:03 PM

Quote:

Originally Posted by newport325i

Can I run 255/45ZR18 on the rears and 225/45ZR18 on the front without rubbing or any other bad stuff?

No, for different reasons, among them that diameter difference between front and back is > 1%.

What you can do, however, is change to 255/40R18 and 225/45ZR18. This will not rub and have the desired effect, see here:

http://www.e90post.com/forums/showthread.php?t=194743

Speedo advance error is actually even corrected by that setup. I know, since I have it.

08-17-2009, 09:37 PM	#1
newport325i Private First Class 4 Rep 140 Posts Drives: \\ 2006 325i Sport // Join Date: Dec 2007 Location: Newport, RI iTrader: (0)	Tire size question I am running goodear eagle f1s on my 2006 325 sport with 18" 162s - staggered set up: 225/40/18 front & 255/35/18 rear. the roads in new england suck at best and as a result i have major bubbles on the sidewall of one of my rear tires - not good. long story short i am replacing all 4 with Kumho Ecsta ASX and I'd like a bit more protection than I have now. Can I run 255/45ZR18 on the rears and 225/45ZR18 on the front without rubbing or any other bad stuff?
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08-18-2009, 02:10 AM	#2
VMRWheels BimmerPost Supporting Vendor 2051 Rep 25,989 Posts Drives: BMW Join Date: Jun 2007 Location: Anaheim, CA iTrader: (4) Garage List 2013 BMW M3 [10.00] 2015 BMW M4 [0.00] 2013 BMW F30 [0.00] 2014 BMW F22 [0.00] 2013 BMW F06 [0.00]	Those sizes are going to be tall and will throw off your speedo as well as cause some rubbing issues during compression or full cabin. I would recommend sticking with the previous setup of 225/40/18 and 255/35/18. -Charles@VMRWheels __________________ VMR\|Wheels \| 714.442.7916 \| sales@velocitymotoring.com \| www.velocitymotoring.com \| facebook \| flickr \| Instagram
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08-18-2009, 06:58 AM	#3
newport325i Private First Class 4 Rep 140 Posts Drives: \\ 2006 325i Sport // Join Date: Dec 2007 Location: Newport, RI iTrader: (0)	got it - thanks for your help - much appreciated!
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