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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > Asia > Hong Kong > Tyre Pressures



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      01-28-2009, 09:03 PM   #1
K3VMO
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Tyre Pressures

Right guys/gals,

Silly question... but heard some random advice from a garage just a few days ago. I'm currently running:

Front: R19/35/235 - Pirelli P-Zero Nero
Rear: R19/30/265 - Pirellia P-Nero Zero

Now I've always assumed the correct typre pressure was 32 PSi. But the other day some random garage was telling me I should be running them at 38 PSi.

That sounds awfully high........ any comment?
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      01-28-2009, 10:14 PM   #2
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I am not so sure about 19", but I am running my 18" at 40 PSI (280 kPa).
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      01-29-2009, 06:26 AM   #3
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I have 19" 235/30 front and 255/30 Rear. Tyre pressure varies depending on temp/season... I run mine at 35PSI front, 33PSI Rear
In general tires lose 1-2 PSI per month in hot weather, you might want to add a +1PSI to your current setup than.
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      02-08-2009, 11:34 AM   #4
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think manufacturer usually quote cold psi numbers, if you want to be clinical abut this, get a pressure gauge and a pump. you might want to consider nitrogen as well.
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      02-10-2009, 11:37 PM   #5
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Quote:
Originally Posted by little_croco View Post
I am not so sure about 19", but I am running my 18" at 40 PSI (280 kPa).

40psi? you needa go to an autocross very often? j/k.
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      02-11-2009, 03:17 AM   #6
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Quote:
Originally Posted by M_M View Post
40psi? you needa go to an autocross very often? j/k.
yes, 40!?
isn't it too high?
u didn't feel slippy ma???
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      02-11-2009, 08:38 AM   #7
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Does anyone check this label?
http://www.convertunits.com/from/bar/to/psi
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      02-11-2009, 09:25 AM   #8
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yes wor, I usually maintain them at around 40psi...
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      02-11-2009, 10:52 AM   #9
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2.7 bar is 39psi....
i guess it's a recommendation for very smooth roads and highway?
i dun think it's acceptable for rough roads like hk!
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      02-11-2009, 08:43 PM   #10
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I am using
Front: R19/35/235 - Hankook S1EVO 34PSI
Rear: R19/30/265 - Hankook S1EVO 36PSI

actually i am also wondering if my setting is correct or not........
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      02-11-2009, 10:46 PM   #11
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i will be a consideration of balancing off ride comfort and gas consumption
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      02-12-2009, 12:29 AM   #12
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umm, after how bmw brag about their 50-50 weight ratio, they recommend different tyre pressures front and rear (also for 225/45 size)??
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      02-16-2009, 11:46 AM   #13
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I run 33 and 35 psi on my 19" 235/35 and 275/30 Mich PS2s (measured cold). But then I prefer a slightly heavier steering. The nose gets considerably lighter as you go from 32 to 34-35.

I used to run 32 all around to make the ride more comfy for the HK Island roads. But I went for the better handling after a while, comfort be damned
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      02-17-2009, 01:11 PM   #14
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lol tyre......
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      03-20-2009, 12:57 AM   #15
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Okies,

After bouncing round a few garages and asking numerous mechanics... it turns out the general consensus is the settings I'm running: 36 PSi (Front) & 38 PSi (Rear).

You can tweak it +/- 2 PSi either way depending on your preference for handling.
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