BMW 1-Series Forum (F20) 135i - 1Addicts.com > Second Generation 1 Series Forum > 2012 BMW 1-Series Sporthatch (F20) Discussion > Tire pressures
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      07-15-2012, 03:34 AM   #1
Nintendofan
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Tire pressures

What sort of tire pressures have you been running? Do you follow the half load or full load recommended pressures? Or something completely different? Please share!

EDIT: I'm using 225/45 17 Bridgestone Potenza S001 tires all-round.

Last edited by Nintendofan; 07-15-2012 at 10:31 AM.
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      07-15-2012, 03:39 AM   #2
ovekvam
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This depends on the tire type you are running. I am running 205/50-17 Michelin Pilot Sport 3 in all corners, and the car is very nicely balanced with 35 psi in all four.
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      07-15-2012, 05:31 AM   #3
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Go Nitrogen filled, they work best
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      07-15-2012, 11:29 PM   #4
Nintendofan
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On the door frame the placard suggests 33 PSI front and 40 PSI rear for a full load on my particular tires (29 front/32 rear for regular load). Isn't this quite a large difference between front and rear? And are these suggestions the same in Europe and elsewhere?

With regards to nitrogen inflation, I've heard that there is negligible benefit over air since it already has about 70% nitrogen. Does anyone want to clarify this?
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      07-16-2012, 04:20 AM   #5
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True air is over 70% Nitrogen
Air also contains water and oxygen and these are what effect the internal thermal dymanics. If you could get dehydrated air that would be better than normal air.
Most servos do not dehydrate their air supply so you keep putting in more water which effects the thermal dynamics and can freeze in very cold climates.

Nitrogen keeps the tyre pressure better regulated than air, which means that your tyres should last longer (excluding boy racers doing donuts), handle better as they stay at the set pressure at the designed speed rating, have no problem in very cold or very hot conditions, and it only costs a few dollars per tyre.
Ideal for run flat tyres I should think.
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      07-17-2012, 09:22 AM   #6
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2012 125i  [4.50]
me and the missus and no great weight, I tend to keep them a tad softer. Makes worse wear-and-tear, but more comfortable in town.
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      08-01-2012, 06:43 AM   #7
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I follow the label on the door (have 205/55/16), for half load. I only inflate them to full load pressure, when I carry 4 people + luggages.
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      08-01-2012, 09:44 AM   #8
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225/40/18 - 2.0 bar

245/35/18 - 2.2 bar

118d M Sport
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      08-05-2012, 03:55 PM   #9
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Not happy with the grip and confort :S
225/45/r17 91w - 2.6
245/40/r17 91w - 3.0

I ride mostly alone but speedy 140/150kmh so i need some extra psi but the bumps are killing me.
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      08-05-2012, 04:41 PM   #10
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Quote:
Originally Posted by topplus View Post
Not happy with the grip and confort :S
225/45/r17 91w - 2.6
245/40/r17 91w - 3.0

I ride mostly alone but speedy 140/150kmh so i need some extra psi but the bumps are killing me.
Event driving at 140-150, I think 3.0 it's a lot, this isn't a 911.

Am I wrongż
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      08-06-2012, 03:00 AM   #11
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35psi works well for most driving conditions, however if you want good life out of your low profile tyres keep them a bit higher (38 psi) as this allows the sides to ride more upright and saves the outer tread as it prevents edge roll better.

Most new LP tyre's have even lower ratio (width to hight) now, so ride will be effected.

If you are running 'run flat' they do benifit from a bulb wall design so the pressure needs to keep the flat section of tread flat on the road.

You often see LP tyres being replaced at low k's with good rubber in the centre but worn away at both edges, a lot of people blame this on soft compounds or hard cornering. Sometimes that is true, but mostly it is caused from under inflation.

We drive cars with dymanic suspension with LP tyres these days, so the trade off is road comfort. The 1er M Sport rides better than a lot of others I have driven
Most tyre fitters will have the correct tyre (tire) pressure value chart for the model of tyre fitted to your wheel and car's weight. Check with your local guy
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      08-06-2012, 05:06 AM   #12
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I don't see any reason not to follow the manufacurers recommendations in the door frame. It's specified for different tyre dimensions, as well as half load or full load.
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      08-06-2012, 08:44 AM   #13
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35 for all 4 wheels. 18", 245
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      08-14-2012, 06:41 PM   #14
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Its odd the same pressures for so many diferent tyres.
Do you have the same sticker ??

I got, Potenza S001- 225/45/r17 91w - 245/40/r17 91w

0.07Bar = 1Psi
2.7Bar = 39Psi
3.2Bar = 46Psi
2.2Bar = 32Psi
2.4Bar = 35Psi
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Last edited by topplus; 08-14-2012 at 07:28 PM.
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      08-23-2012, 06:34 AM   #15
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weird... my tire pressure sticker is different!

Hi guys. New to the forum. First of all, thanks for all the posts. It has been a great source of knowledge and tips about my new car (118d urban)!

Now, the reason I'm posting:

My tire pressure sticker is different than this previous one posted by topplus! Since the sticker has all the possible tire combinations, shouldn't it be the same sticker for every F20??

I'm running on standard Bridgestone Turanza 205/55 R16 and got to this thread because I was feeling that the suggested tire pressure on my sticker was a little to low, making the tires very (very!) soft.
That's when I ran to the previous post and saw the recommended tire pressure on topplus's sticker was higher then the pressure my sticker suggested!

What do you make of this?

I'm now running with 2.1 front and 2.3 rear. It's a compromise between my sticker and topplus one... and it better than it was before, that is for sure!

Thanks guys.
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      08-23-2012, 06:54 AM   #16
ovekvam
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You can run all tire combinations on any F20, but a heavier version of the F20 would require higher pressures than a light version. If you have a 114i with no optional extras, it will be significantly lighter than an M135i with all options.
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      08-24-2012, 08:08 AM   #17
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Quote:
Originally Posted by Fanis View Post
I follow the label on the door (have 205/55/16), for half load. I only inflate them to full load pressure, when I carry 4 people + luggages.
Fanis, could you please post the tire pressure sticker of your F20 ?
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