How Much PSI??
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Joined: Nov 2008
Posts: 2,134
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From: Queens NY
My Ride: 2008 550i manual
Model Year: 2008
Engine: V8
As the topic says I have 20" DPE st-10 wheels and as everyone has seen I had a blow out during midnight run. I was running front 245/30/20 rear 285/25/20 with 36 PSI all around. right now I have front 245/35/20 and rear 285/30/20 can someone help me on how much PSI is good for 20" rims? I would like to know before this saterday as it is bear mt and my car is in the shop right now being raised and adjusted. 
Link to my blown tire....
https://5series.net/forums/topic/996...un-2010-video/
Link to my blown tire....
https://5series.net/forums/topic/996...un-2010-video/
Contributors
Joined: May 2009
Posts: 10,496
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From: SoCal
My Ride: 2008 550I LOADED, all options except HUD and NV
I run the same size tires as you are now (F - 245/35/20, R - 285/30/20). I am running 40psi in the front and 38 in the rear. A lot of others run near 35 PSI, but since I have coilovers I wanted the tires a little stiffer as well.
BTW, you're a brave man running 25 sidewalls in NYC - eesh, I am not that brave
BTW, you're a brave man running 25 sidewalls in NYC - eesh, I am not that brave
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The specific PSI for any tire size is listed on the driver's side door panel, and is listed in your owner's manual. Depending on the specific tire and typical load of your car (number of passengers etc.), BMW recommends between 32 to 35 psi.
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I think those recommended PSI were intended for stock rims, not 20"
Contributors
Joined: May 2009
Posts: 10,496
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From: SoCal
My Ride: 2008 550I LOADED, all options except HUD and NV
Contributors
Joined: May 2009
Posts: 10,496
Likes: 2
From: SoCal
My Ride: 2008 550I LOADED, all options except HUD and NV
Oh also there was a great little article in Roundel a couple of months ago on how to properly adjust your tire pressure, it was focused on auto-x but works well for daily driving as well. 
Thread Starter
Contributors
Joined: Nov 2008
Posts: 2,134
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From: Queens NY
My Ride: 2008 550i manual
Model Year: 2008
Engine: V8
thanks for all the help guys pjinca your crazy! 20% all around.... 
then i notice socal lol much better roads then here... yea i got 35/30 now because of the nyc street.. i think im going to put 35-40 all around
then i notice socal lol much better roads then here... yea i got 35/30 now because of the nyc street.. i think im going to put 35-40 all around
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Joined: Oct 2007
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From: Milky Way, Earth, N. America, CA, San Jose, 95136, Latitude N 37� 16.837, Longitude W 121� 50.461
My Ride: 2004 530i | Sapphire Black | Sport | Premium | NAV | Logic 7 | DPE R07 Variant S Gloss Black with Polished Lip 20x8.5 front 20x10 rear | Falken FK452 tires 245/30/20 front 275/30/20 rear | H&R Coilovers | Smoked Tail Lights | M5 trunk spoiler | AC Schnitzer style roof spoiler | HID 8000K headlights & foglights | 35% tint all around | Sprint Booster | Speed Innovation ECU tuning | M5 trunk finisher | M-Tech body kit | Remus Quad Exhaust | AC Schnitzer style pedals | Euro Stickers | RPi Ram Air Induction | Smoked LED Side Lenses | AC Schnitzer style e-brake handle | AC Schnitzer style shifter | AC Schnitzer style iDrive knob | AC Schnitzer style carbon fiber diffuser | carbon fiber hood/trunk/steering emblems | carbon fiber grilles | carbon fiber door pillars | MTEC v2 Angel Eyes | Hamann style carbon fiber splitter
40psi all around - wheel/tire size in sig
