stock set up 225/35 R18 upfront?

cpandrewschmidt · 03-03-2011, 02:39 PM

Hi all,
Ran through 5 pages of a search but couldn't find any solid info. I have an 07 335i running the Type 162 (Front: 18x8 ET34 225/40 R18) (Rear: 18x8.5 ET37 255/35 R18) rims. Looking to replace my tires.

Is there any reason why I cant run 225/35 R18 tires up front to match the profile of the rear? Why would bmw run a taller tire up front? What are the positives and negitives of that set up? Thanks

Andrew

MKE_M3 · 03-04-2011, 07:53 AM

the 35 is not a profile, it is a percent. The stock set-up tire side walls are 225*.4 = 90mm in the front and 255*.35 = 89.25mm in the rear, almost identical.

If you make the change you mention, your front side wall would be 225*.35 = 79mm, which is way off.

cpandrewschmidt · 03-04-2011, 10:14 AM

ahhh, you really do learn something new everyday! Thanks

VMRWheels · 03-04-2011, 01:02 PM

The taller side wall is to compensate for the rolling diameter of the wider rear tire. If you were to run a thinner sidewall it would change the rolling diameter to over 3% of what is recommended.

-Charles@VMRWheels

03-03-2011, 02:39 PM	#1
cpandrewschmidt Private 14 Rep 85 Posts Drives: 2011 n55 135i dct Join Date: Feb 2009 Location: Madison, WI iTrader: (0)	stock set up 225/35 R18 upfront? Hi all, Ran through 5 pages of a search but couldn't find any solid info. I have an 07 335i running the Type 162 (Front: 18x8 ET34 225/40 R18) (Rear: 18x8.5 ET37 255/35 R18) rims. Looking to replace my tires. Is there any reason why I cant run 225/35 R18 tires up front to match the profile of the rear? Why would bmw run a taller tire up front? What are the positives and negitives of that set up? Thanks Andrew
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03-04-2011, 07:53 AM	#2
MKE_M3 Lieutenant Colonel 65 Rep 1,705 Posts Drives: 2011 e90 M3 Join Date: Feb 2009 Location: Milwaukee, WI iTrader: (0)	the 35 is not a profile, it is a percent. The stock set-up tire side walls are 225.4 = 90mm in the front and 255.35 = 89.25mm in the rear, almost identical. If you make the change you mention, your front side wall would be 225*.35 = 79mm, which is way off.
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03-04-2011, 10:14 AM	#3
cpandrewschmidt Private 14 Rep 85 Posts Drives: 2011 n55 135i dct Join Date: Feb 2009 Location: Madison, WI iTrader: (0)	ahhh, you really do learn something new everyday! Thanks
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03-04-2011, 01:02 PM	#4
VMRWheels BimmerPost Supporting Vendor 2046 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]	The taller side wall is to compensate for the rolling diameter of the wider rear tire. If you were to run a thinner sidewall it would change the rolling diameter to over 3% of what is recommended. -Charles@VMRWheels __________________ VMR\|Wheels \| 714.442.7916 \| sales@velocitymotoring.com \| www.velocitymotoring.com \| facebook \| flickr \| Instagram
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