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      05-30-2020, 07:26 PM   #1
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Tire pressure

Have 22inch summer Contis dealer installed on my M50i checked pressure today and it reads 40psi on front and backs. What is optimal pressure ? I mostly drive solo but occasionally with wife and 7 yr old.
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      05-30-2020, 10:33 PM   #2
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Originally Posted by M50iX5 View Post
Have 22inch summer Contis dealer installed on my M50i checked pressure today and it reads 40psi on front and backs. What is optimal pressure ? I mostly drive solo but occasionally with wife and 7 yr old.
In Europe it is printed on a badge in the inside of your drivers door and it is included in the tire pressure monitor. If you activate TPM it will show the actual and optimal pressure if you have entered the correct wheel size.

We use different metrics so can't help you with the figures

It is also written in the manual. It is not included in the app version. It refers to the badge in the door.
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      05-31-2020, 05:27 AM   #3
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Thanks yes I did see that but my understanding was that those pressure numbers are for maximum load as I am the primary driver was wondering if there's a more optimal number
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      05-31-2020, 06:43 AM   #4
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Found earlier and relevant questions on 22" and PSI:

Correct Tire Pressure https://g05.bimmerpost.com/forums/sh....php?t=1668176

Thread above for 22", 38-39F/45R for 5 passengers. You can lower depending on your comfort or less than 5 passenger load.

For example, I'm running 33F/41R on 20" A/S. I wouldn't run 22" less than 36F/42R or equal pressures front and back.
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      05-31-2020, 11:40 AM   #5
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Quote:
Originally Posted by M50iX5 View Post
Thanks yes I did see that but my understanding was that those pressure numbers are for maximum load as I am the primary driver was wondering if there's a more optimal number
It shows two values. One for driver alone and one for driver with passengers and luggage
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      05-31-2020, 04:43 PM   #6
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Thanks doesn't show on my M50i maybe it's because it's a Canada based vehicle? Does anyone have a picture they could post showing the different pressure options for the 22s
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      05-31-2020, 08:30 PM   #7
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Found this (I assume maximum cold inflation loaded):

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      06-01-2020, 03:13 AM   #8
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This is the badge in my car. The lower values printed in italics are psi.

Three figures= normal
Five = fully loaded

These are the values for the 45e which has a 250 kg battery on the rear axel. I don't know if they would advise a different pressure for other engines.

So your 40 psi seems quite high if you are driving alone on the 22 inch summers.

I also added pictures from Idrive. I can chose the type of tires (bandensoort) winter vs summer and load (belading). And it displays this in the picture (vereiste druk) in this case 2.3 bar in front and 2.5 in the back

Strange that the car doesn't follow the advise on the badge by the way. Both 0.1 bar higher.
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      06-01-2020, 07:54 AM   #9
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Recommended pressures are usually listed on a sticker inside the driver's side door. If not there, then the owners manual will have a chart, and BMW helpfully shows a chart in iDrive for OEM tires for a specific vehicle. Nothing wrong with using the loaded pressure recommendation as a starting point (you'll get better mileage, but a potentially harsher ride), and adjust down from there - underinflation is worse than oveinflation with respect to tire life, fuel economy, braking or acceleration. That's what I use, because sometimes the car is loaded, sometimes it's not, and my label doesn't even have a partially-loaded pressure recommendation:

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Just never use the maximum inflation pressure listed on the sidewall as a guide - you're in dangerous territory if you're at or above that.
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      06-01-2020, 08:40 AM   #10
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Quote:
Originally Posted by Paladin1 View Post
Recommended pressures are usually listed on a sticker inside the driver's side door. If not there, then the owners manual will have a chart, and BMW helpfully shows a chart in iDrive for OEM tires for a specific vehicle. Nothing wrong with using the loaded pressure recommendation as a starting point (you'll get better mileage, but a potentially harsher ride), and adjust down from there - underinflation is worse than oveinflation with respect to tire life, fuel economy, braking or acceleration. That's what I use, because sometimes the car is loaded, sometimes it's not, and my label doesn't even have a partially-loaded pressure recommendation:

Attachment 2326831

Just never use the maximum inflation pressure listed on the sidewall as a guide - you're in dangerous territory if you're at or above that.
Looks like your values match the unloaded ones in my sticker.

Do you live in Canada? Or do all cars in the us have English and French stickers?
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      06-01-2020, 08:54 AM   #11
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Quote:
Originally Posted by M50iX5 View Post
Thanks doesn't show on my M50i maybe it's because it's a Canada based vehicle? Does anyone have a picture they could post showing the different pressure options for the 22s
On my sticker you would need 35 psi in front and 38 psi in the rear for 22 inch driving alone. If you are ok with the comfort it should be fine if not you can lower it a bit.
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      06-01-2020, 09:22 AM   #12
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Quote:
Originally Posted by X5 45e View Post
Looks like your values match the unloaded ones in my sticker.

Do you live in Canada? Or do all cars in the us have English and French stickers?

Nope, US. I think the default is bilingual for NA. The values for the door stickers are for maximum load if no other values are indicated in the US also
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      06-01-2020, 09:57 AM   #13
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Quote:
Originally Posted by Paladin1 View Post
Quote:
Originally Posted by X5 45e View Post
Looks like your values match the unloaded ones in my sticker.

Do you live in Canada? Or do all cars in the us have English and French stickers?

Nope, US. I think the default is bilingual for NA. The values for the door stickers are for maximum load if no other values are indicated in the US also
The values on your sticker are the ones that are advised for a normally loaded vehicle on my sticker. The values for fully loaded 275 20 inch are higher: 42 and 49 psi.

I also have 20 inches but in Europe they are staggered 275 and 305. For me the best choose. I like the look and the comfort is good.
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      06-01-2020, 10:32 AM   #14
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Quote:
Originally Posted by X5 45e View Post
The values on your sticker are the ones that are advised for a normally loaded vehicle on my sticker. The values for fully loaded 275 20 inch are higher: 42 and 49 psi.

I also have 20 inches but in Europe they are staggered 275 and 305. For me the best choose. I like the look and the comfort is good.
Interesting - this is the pertinent regulatory reference from the NTHSA in the US for labeling requirements:

Paragraph S4.3 of FMVSS No. 110
requires manufacturers to affix a placard
to each passenger car’s glove
compartment door or an equally
accessible location showing the
vehicle’s capacity weight, designated
seating capacity, the manufacturer’s
recommended cold tire inflation
pressure for maximum loaded vehicle
weight,
the manufacturer’s
recommended tire size designation, and,
for a vehicle equipped with a non-
pneumatic spare tire assembly, the non-
pneumatic identification code required
by FMVSS No. 129, New Non-
Pneumatic Tires for Passenger Cars.


Most US cars manufactured since 2003 have the placard located on the driver's side door pillar, but it can be located elsewhere. Sounds like European regulatory requirements may be different, but as long as ranges are within manufacturing tolerances shouldn't matter.
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      06-01-2020, 10:52 AM   #15
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Quote:
Originally Posted by Paladin1 View Post
Quote:
Originally Posted by X5 45e View Post
The values on your sticker are the ones that are advised for a normally loaded vehicle on my sticker. The values for fully loaded 275 20 inch are higher: 42 and 49 psi.

I also have 20 inches but in Europe they are staggered 275 and 305. For me the best choose. I like the look and the comfort is good.
Interesting - this is the pertinent regulatory reference from the NTHSA in the US for labeling requirements:

Paragraph S4.3 of FMVSS No. 110
requires manufacturers to affix a placard
to each passenger car’s glove
compartment door or an equally
accessible location showing the
vehicle’s capacity weight, designated
seating capacity, the manufacturer’s
recommended cold tire inflation
pressure for maximum loaded vehicle
weight,
the manufacturer’s
recommended tire size designation, and,
for a vehicle equipped with a non-
pneumatic spare tire assembly, the non-
pneumatic identification code required
by FMVSS No. 129, New Non-
Pneumatic Tires for Passenger Cars.


Most US cars manufactured since 2003 have the placard located on the driver's side door pillar, but it can be located elsewhere. Sounds like European regulatory requirements may be different, but as long as ranges are within manufacturing tolerances shouldn't matter.
The picture I posted is the sticker on my drivers door. But it looks different than yours indeed.

The only thing is that I have a 45e which is a heavier car. Maybe that can explain the difference. I don't know.

I can't explain the difference either.
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      06-01-2020, 12:29 PM   #16
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Quote:
Originally Posted by X5 45e View Post
The picture I posted is the sticker on my drivers door. But it looks different than yours indeed.

The only thing is that I have a 45e which is a heavier car. Maybe that can explain the difference. I don't know.

I can't explain the difference either.
It is confusing! Also noted that some of the recommended pressures on your sticker (I couldn't decipher whether for 20, 21 or 22 inch tires) exceed the max pressure recommended on the sidewall of my tires, but mine are squared vs staggered (20" Bridgestone, 44 psi). Probably the best bet for the X5 is to go by the OEM pressures for specific tires listed in iDrive in the TPM Reset menu.
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      06-01-2020, 12:59 PM   #17
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Quote:
Originally Posted by Paladin1 View Post
Quote:
Originally Posted by X5 45e View Post
The picture I posted is the sticker on my drivers door. But it looks different than yours indeed.

The only thing is that I have a 45e which is a heavier car. Maybe that can explain the difference. I don't know.

I can't explain the difference either.
It is confusing! Also noted that some of the recommended pressures on your sticker (I couldn't decipher whether for 20, 21 or 22 inch tires) exceed the max pressure recommended on the sidewall of my tires, but mine are squared vs staggered (20" Bridgestone, 44 psi). Probably the best bet for the X5 is to go by the OEM pressures for specific tires listed in iDrive in the TPM Reset menu.
It indicates indeed that for your tires, fully loaded 49 psi is advised for the back tires.

The sticker is a bit hard to read.
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      06-01-2020, 02:38 PM   #18
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Quote:
Originally Posted by X5 45e View Post
It indicates indeed that for your tires, fully loaded 49 psi is advised for the back tires.

The sticker is a bit hard to read.
Thanks! Just checked and the max on the sidewall is 50psi, so just in range. Must be the additional weight on the 45e....
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      06-12-2020, 12:46 PM   #19
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Quote:
Originally Posted by M50iX5 View Post
Have 22inch summer Contis dealer installed on my M50i checked pressure today and it reads 40psi on front and backs. What is optimal pressure ? I mostly drive solo but occasionally with wife and 7 yr old.
My M50i also has the 22 inch with staggered pressures. I think it recommended 39 front and 44 rear in the idrive display menu. First car I ever owned that suggests different pressures for front and rear.
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