Tire pressure

mouro520 · 11-20-2015, 05:22 PM

I purchased 225/45/18 for the front and 255/40/18 for the rear. The manual says 32psi front and rear for 225/45/17 and 255/40/17 and 33psi front and 35psi rear on 225/40/18 and 255/35/18. How would I calculate the correct psi or would I just use 33/35psi? I bought XL tires

elh0102 · 11-21-2015, 03:57 PM

It won't make any practical difference in terms of ride quality or tire wear. I always start with either equal pressures, or slightly more in front, as it generally tends to make the handling balance a bit more neutral.

jimj911 · 11-21-2015, 04:00 PM

pictures? I am thinking of puchasing the same size in snows and would love to see how they fill out the wheel wells!

cdgatti · 11-21-2015, 04:09 PM

if you went from rft to non-rft either go with what your door card says or about 2 psi more in front and back.

11-21-2015, 04:57 PM

How about trying a bunch of different settings and seeing what you like best; it's free.

11-20-2015, 05:22 PM	#1
mouro520 New Member 0 Rep 6 Posts Drives: 2009 328xi Coupe Join Date: Nov 2015 Location: Union, NJ iTrader: (0)	Tire pressure I purchased 225/45/18 for the front and 255/40/18 for the rear. The manual says 32psi front and rear for 225/45/17 and 255/40/17 and 33psi front and 35psi rear on 225/40/18 and 255/35/18. How would I calculate the correct psi or would I just use 33/35psi? I bought XL tires
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11-21-2015, 03:57 PM	#2
elh0102 Captain 15 Rep 751 Posts Drives: 2009 335i coupe Join Date: Apr 2010 Location: USA iTrader: (0)	It won't make any practical difference in terms of ride quality or tire wear. I always start with either equal pressures, or slightly more in front, as it generally tends to make the handling balance a bit more neutral.
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11-21-2015, 04:00 PM	#3
jimj911 When the F#$% did we get ice cream? 150 Rep 101 Posts Drives: 2008 BMW 335i (E92) Join Date: Jun 2015 Location: Kintnersville, PA iTrader: (0) Garage List 2014 BMW 535d Msport [0.00] 2014 Dodge 3500 dually [10.00] 2008 BMW 335i E92 [10.00] 1999 Jeep Wrangler [0.00]	pictures? I am thinking of puchasing the same size in snows and would love to see how they fill out the wheel wells! __________________ '08 BMW 335i, Dinan Stage 2 '14 BMW 535d Xdrive Msport, Stage 2 '14 Dodge 3500 Cummins Longhorn dually '15 BMW X5M
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11-21-2015, 04:09 PM	#4
cdgatti Colonel 262 Rep 2,547 Posts Drives: e90 328i Join Date: May 2011 Location: KY iTrader: (4)	if you went from rft to non-rft either go with what your door card says or about 2 psi more in front and back. __________________ OEM Black grill and Blackline tails - LCI halogens with Lux V2 coded as DRL - 3M Crystalline - BMS PBX - OEM Euro Airbox with K&N - Hardwired CTEK - Bilstein B6 w/OEM springs and SP perches - Conti DWS06 - HiFi-Helix DSP - JLAudio HD/XD-Morel - CD changer trim - AE optical out
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11-21-2015, 04:57 PM	#5
FCobra94 Guest 0 Rep n/a Posts Drives:	How about trying a bunch of different settings and seeing what you like best; it's free.
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