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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Wheels / Tires / Suspension / Brakes 18" wheels owners, what tires pressure?
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      05-13-2012, 05:12 PM   #1
The X Men
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18" wheels owners, what tires pressure?

To all the 18" wheels owners out there ,what tires pressure are you guys running? The door jam saids 35 front and 39 rear, is anyone running higher or lower tires pressure? Also, do you think the front tires will wear differently from the back since there is 4 PSI difference.
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      05-14-2012, 05:19 AM   #2
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Quote:
Originally Posted by The X Men View Post
To all the 18" wheels owners out there ,what tires pressure are you guys running? The door jam saids 35 front and 39 rear, is anyone running higher or lower tires pressure? Also, do you think the front tires will wear differently from the back since there is 4 PSI difference.
2.2Bar all around (M-Sport). Thats 32PSI
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      05-14-2012, 05:53 AM   #3
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Quote:
Originally Posted by The X Men View Post
To all the 18" wheels owners out there ,what tires pressure are you guys running? The door jam saids 35 front and 39 rear, is anyone running higher or lower tires pressure? Also, do you think the front tires will wear differently from the back since there is 4 PSI difference.
Sounds about right to me, OEM recommendation is typically best balance for wear and handling. Be aware, RFTs at low pressures are likely to wear much faster on the shoulders, so don't be tempted to run low pressures for a 'softer' ride. It doesn't work.

Rears typically wear much faster on a RWD BMW anyway, regardless of pressure. Always been the way and if we don't, or can't rotate, we replace rears much more often.

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      05-14-2012, 06:42 AM   #4
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31 front, 33 rear, wear perfectly even across the tread, rears naturally more worn than the fronts, but still showing at least half life remaining after 16k miles.
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      05-14-2012, 08:19 AM   #5
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31 front, 33 rear, wear perfectly even across the tread, rears naturally more worn than the fronts, but still showing at least half life remaining after 16k miles.
That is much lower than the recommanded pressure, are you running the lower pressure for a sofer ride and better traction?
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      05-14-2012, 01:39 PM   #6
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Quote:
Originally Posted by The X Men View Post
That is much lower than the recommanded pressure, are you running the lower pressure for a sofer ride and better traction?
Recommended pressures as per door frame decal:

Front 245/45/18: 2.0-2.5 bar (29-36psi) light-heavy load

Rear 275/40/18: 2.2-2.7 bar (32-39psi) --------"---------

My pressures, as stated earlier: F 31psi, R 33psi, can't see anything "much lower than recommended" there.
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      05-14-2012, 06:05 PM   #7
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The US label just say 35 front and 39 rear, no min pressure recommandation.
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      05-14-2012, 11:49 PM   #8
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Quote:
Originally Posted by The X Men View Post
That is much lower than the recommanded pressure, are you running the lower pressure for a sofer ride and better traction?
Actually this is what the label says for my car. Of course it gives higher pressure for more load but to be honest I was always a bit confused about it. I am mostly driving alone.

Any other suggestions besides 2.2bar? Safe to go 2.5?
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      05-15-2012, 03:15 AM   #9
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Quote:
Originally Posted by inny View Post
Actually this is what the label says for my car. Of course it gives higher pressure for more load but to be honest I was always a bit confused about it. I am mostly driving alone.

Any other suggestions besides 2.2bar? Safe to go 2.5?
I suggest that you experiment within the recommended pressure range to find the ride and handling characteristics that suit you best.
It took me a while to establish my figures and, based on the fact that, after 16k miles, the wear is perfectly even across the tread, it would appear that I wasn't far off the mark.
Like you, I usually drive alone or with one front passenger and almost always lightly loaded. However, if I want to take a long trip with an increased load I adjust the pressures accordingly with a portable 12v compressor.
Most importantly, don't forget that accurate tyre pressures can only be maintained by using a reliable good quality gauge.
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      05-15-2012, 03:48 AM   #10
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Quote:
Originally Posted by Jon D View Post
Recommended pressures as per door frame decal:

Front 245/45/18: 2.0-2.5 bar (29-36psi) light-heavy load

Rear 275/40/18: 2.2-2.7 bar (32-39psi) --------"---------

My pressures, as stated earlier: F 31psi, R 33psi, can't see anything "much lower than recommended" there.
That is interesting Jon, but must say I'm surprised BMW are running the lower front figure. Particularly on the 535d. Then it is a quite a big wheel these days, that makes a difference. My old 540i needed 35psi up front, as does my 330d, both on 45 section tyres.


Quote:
Originally Posted by Jon D View Post
I suggest that you experiment within the recommended pressure range to find the ride and handling characteristics that suit you best.
It took me a while to establish my figures and, based on the fact that, after 16k miles, the wear is perfectly even across the tread, it would appear that I wasn't far off the mark.
Like you, I usually drive alone or with one front passenger and almost always lightly loaded. However, if I want to take a long trip with an increased load I adjust the pressures accordingly with a portable 12v compressor.
Most importantly, don't forget that accurate tyre pressures can only be maintained by using a reliable good quality gauge..
What you are saying is the best way to get it right anyway. I start with the lower 'light load' recommendation and work from there, get the balance of driving quality vs. best wear rate.

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      05-15-2012, 12:29 PM   #11
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I run 35 front and 39 rear. Always go by what's indicated on the door jam if the tires came with the car.
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      05-16-2012, 02:41 AM   #12
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Quote:
Originally Posted by JNoSol View Post
I run 35 front and 39 rear. Always go by what's indicated on the door jam if the tires came with the car.
If you have 245/45/18 front and 275/40/18 rear, those pressures are for a fully laden car. Doesn't your door decal indicate a pressure range from light to full load?
Handling characteristics and tyre wear are affected by how heavy the car is and this is compensated for by the manufacturer's recommended range of adjustment.
UK cars have this range clearly indicated on the door frame decal.
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      05-16-2012, 01:14 PM   #13
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Quote:
Originally Posted by Jon D View Post
If you have 245/45/18 front and 275/40/18 rear, those pressures are for a fully laden car. Doesn't your door decal indicate a pressure range from light to full load?
Handling characteristics and tyre wear are affected by how heavy the car is and this is compensated for by the manufacturer's recommended range of adjustment.
UK cars have this range clearly indicated on the door frame decal.
Yes, my car does indicate 2 pressure recommendations. I usually keep them towards the high side, maybe 2psi less. The higher pressure recommendation not only for full load, but higher speed as well. If you drive above 80mph, you should alway air up towards the higher spec.

As for the full load or light, I rather air it for the full load spec. I never know when I'm taking a full car of people to lunch. It's not like I could go air up, then come back to get them.
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      05-17-2012, 02:54 AM   #14
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Quote:
Originally Posted by JNoSol View Post
Yes, my car does indicate 2 pressure recommendations. I usually keep them towards the high side, maybe 2psi less. The higher pressure recommendation not only for full load, but higher speed as well. If you drive above 80mph, you should alway air up towards the higher spec.

As for the full load or light, I rather air it for the full load spec. I never know when I'm taking a full car of people to lunch. It's not like I could go air up, then come back to get them.
It all comes down to personal preference and if you're happy with running on the high side, then that's all that matters.
I keep mine towards the low side because I usually run lightly loaded and, after experimenting extensively within the range, I find it gives me the best ride and handling. Additionally, as I mentioned earlier, tyre wear is also a significant factor to consider and considering that mine are all perfectly even across the tread, it indicates that I've found what's right for me.
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      05-27-2012, 11:22 PM   #15
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I run 34 all around~!
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      03-25-2019, 03:16 PM   #16
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Anyone runs this configuration? 245/45 99Y R18 Front / 275/40 96 Y R18 Rear. I struggle with choosing the correct tyre pressure for this setup. Now I'm on 32 PSI Front/ 34 Rear.( Pirelli Cinturato P7 Runflats). Thanks in advance 👍🏻😁.
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