Tire pressure with differing size wheels?

techietaichi · 05-20-2013, 10:19 PM

Ok, so I've had this on my brain for a while but never really confirmed my assumption. I have a 325i and stock wheels were 16". Front tire pressure stock is 29psi and the rear 30psi. I now have 19" wheels and have kept the pressure the same. I haven't really observed any difference as my MPG is still consistent at 22.8, but I'm wondering if I'm running at the optimal pressure for my size wheels. Can someone elaborate on this or am I correct to use the stock pressures recommended for the 16's?

gtaccord · 05-21-2013, 09:52 AM

You should be fine running those pressures but I would recommend running something more like 32 fr, 38 rear or highly. The tires will wear better, the handling will probably improve and you should see a small bump in mpg.

White D · 05-21-2013, 01:22 PM

I would pump them up to about 37 front 40 back.
With that little of sidewall, I like to have the tire a little harder for more protection.
Also boosts MPG's.
Check after a few thousand miles to make sure they are wearing even. If not adjust accordingly.

VMRWheels · 05-21-2013, 01:43 PM

+1

Might want to bump the pressure up a bit.

05-20-2013, 10:19 PM	#1
techietaichi Major 295 Rep 1,311 Posts Drives: 2006 325i Pre-LCI & 2010 X3 Join Date: Aug 2012 Location: Massghanistan, USA iTrader: (1)	Tire pressure with differing size wheels? Ok, so I've had this on my brain for a while but never really confirmed my assumption. I have a 325i and stock wheels were 16". Front tire pressure stock is 29psi and the rear 30psi. I now have 19" wheels and have kept the pressure the same. I haven't really observed any difference as my MPG is still consistent at 22.8, but I'm wondering if I'm running at the optimal pressure for my size wheels. Can someone elaborate on this or am I correct to use the stock pressures recommended for the 16's? __________________
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05-21-2013, 09:52 AM	#2
gtaccord Major 60 Rep 1,465 Posts Drives: 2009 BMW 335xi Join Date: Feb 2012 Location: Maryland iTrader: (7) Garage List 2009 BMW 335i xdrive [0.00]	You should be fine running those pressures but I would recommend running something more like 32 fr, 38 rear or highly. The tires will wear better, the handling will probably improve and you should see a small bump in mpg.
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05-21-2013, 01:22 PM	#3
White D Private 0 Rep 60 Posts Drives: 2011 335d Sport Join Date: May 2013 Location: United States - Houston iTrader: (0)	I would pump them up to about 37 front 40 back. With that little of sidewall, I like to have the tire a little harder for more protection. Also boosts MPG's. Check after a few thousand miles to make sure they are wearing even. If not adjust accordingly.
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05-21-2013, 01:43 PM	#4
VMRWheels BimmerPost Supporting Vendor 2080 Rep 25,980 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]	+1 Might want to bump the pressure up a bit. __________________ VMR\|Wheels \| 714.442.7916 \| sales@velocitymotoring.com \| www.velocitymotoring.com \| facebook \| flickr \| Instagram
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