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OK, so according to the manual: "The Tire and Loading Information placard is on the B-pillar on the driver's side of the vehicle". But it turns out that my new EQS SUV has three different placards - each with different pressures for my tires (275/45 R21).
Front: 47 psi; Rear: 43 psi
Front: 47 psi; Rear: 50 psi
(normal load) Front 41 psi; Rear 41 psi. (maximum load) Front 47 psi; Rear 43 psi.
The actual tire pressures currently in my car (that I picked up from the dealer two days ago) are: Front: 44 psi; Rear: 37 psi - which doesn't correspond to any of the above. I have no idea what my tire pressures are supposed to be. Help!
MB includes U.S. DOT-mandated tire pressure placard (whitecard) on the driver’s side door jamb, and MB recommended tire pressure is a sticker behind the gas filler/charging door. You can see 1st one says extra load, 2nd one is based on gross weight (basically the maximum total safe weight of your vehicle), and 3rd one looks like MB recommended tire pressure depending on your car load. Normal load is 2-3 passengers with min cargo for daily driving. Max load means max of passengers plus fully loaded cargo. DOT sticker (whitecard) matches to your recommended max loading on MB sticker to keep you safe in any condition. Also you can check your max allowable cold tire pressure on the side of your tire (mine is 50psi for XL tires) that might be based on GWR...
MB service deflated my tires below the recommended pressure for my rim size at my first A service and when I asked why, they said to make it comfortable. Then they told me to inflate it. Apart from pothole damage and scrapes, your tires need to be at the right pressure to have even tire tread wear, so you should always adjust the tire pressure based on ambient temperature (for every 10F~1psi pressure change) and load of the car.
As stated above the pressures listed on the charging door are correct. Do not go by how the tires might be returned from the dealership as they are not always accurate. I’ve had MB’s in for service A’s and B’s where they never checked the tire pressure or air filters or windshield wiper condition like they are supposed to. Sad fact for what you pay.
One of the placards was for a stagered setup 20" & 21". One must take care reading the numbers because MB often lists pressures for normal and heavy loads, high speed driving and different tire sizes..
Tire pressure recommendations for electric cars are important to follow. Tires sizes and tire types (summer vs mud and snow) as well as run flats can all have different inflation recommendations. To maximize range keep tire pressure at recommended inflation level. Make sure to add air when tires are cold rather then after driving at highway speeds. Also if possible use 100% nitrogen if available. Costco uses Nitrogen for tire inflation. Nitrogen tends to hold pressure longer then just using regular air available at most fill stations. The tires themselves list maximum cold tire pressure. This is a heavy car and properly inflated tires insures appropriate performance and driving range. You can overfill tire pressure and suffer uneven tire wear vs under inflate and suffer a possible tire disaster.
So verify tire size with tire inflation recommendations as well as vehicle loading to maximize overall range and performance. Tire pressures are critical in my estimation. Under inflation is dangerous while over inflation results in uneven tire wear.
As stated above the pressures listed on the charging door are correct. Do not go by how the tires might be returned from the dealership as they are not always accurate. I’ve had MB’s in for service A’s and B’s where they never checked the tire pressure or air filters or windshield wiper condition like they are supposed to. Sad fact for what you pay.
All three labels are from the drivers side door jam of the EQS SUV. There are no tire pressure charts on the charging flap.
Received a phone call on Saturday, October 15 and told the 580 had officially left final assembly and had been put into the delivery pool. Crickets since then….
OK, so according to the manual: "The Tire and Loading Information placard is on the B-pillar on the driver's side of the vehicle". But it turns out that my new EQS SUV has three different placards - each with different pressures for my tires (275/45 R21).
Front: 47 psi; Rear: 43 psi
Front: 47 psi; Rear: 50 psi
(normal load) Front 41 psi; Rear 41 psi. (maximum load) Front 47 psi; Rear 43 psi.
The actual tire pressures currently in my car (that I picked up from the dealer two days ago) are: Front: 44 psi; Rear: 37 psi - which doesn't correspond to any of the above. I have no idea what my tire pressures are supposed to be. Help!
This is a tradition with MB, conflicting tire pressure information. Several models have this endearing MB quirk, or is it incompetence from MB?
Inflate them anywhere from the lowest value on any decal, up to the max on the tire sidewall. It doesn’t matter.
One of the placards was for a stagered setup 20" & 21".
That's not the way I interpreted it (I assume you're referring to the second placard that I posted). I interpreted this placard as meaning:
The front tires should be at 41 psi (normal load) or 47 psi (maximum load), regardless of whether they're 20" or 21".
If you have 20" rear tires, they should be at 41 psi (normal load) or 45 (maximum load).
If you have 21" rear tires, they should be 41 psi (normal load) or 43 (maximum load).
Folks, thanks for the responses so far. However, note that there is not a tire pressure placard inside the charging door. All three placards that I posted were from the driver's side door jamb. And they have conflicting information. I'm guessing that most (if not all) new EQS SUV owners in the US will see this - multiple placards with conflicting tire pressure recommendations. So it would be nice to get some clear guidance here.
Personally, I'm still not sure what tire pressures I should use. For my front tires, I see recommendations of 47 psi (three times), and 41 psi. For my rear tires, I see recommendations of 41 psi, 43 psi (twice), and 50 psi. Personally, I'd prefer to optimize vehicle range and tire life (and safety) over comfort, so - unless I hear a clear argument to the contrary - I'm going to choose 47 psi for my front tires, and 43 psi for my rear tires.
The labels point to 3 different tire setups - 265/50 R20 XL w/ 275/45 R21 XL (stagered, extra load ), 275/45 R21 (square, std load) and 275/45 R21 XL (square). Use the numbers that match your tire. Note that the load rating is lower for tires without the XL designation.
That's not the way I interpreted it (I assume you're referring to the second placard that I posted). I interpreted this placard as meaning:
The front tires should be at 41 psi (normal load) or 47 psi (maximum load), regardless of whether they're 20" or 21".
If you have 20" rear tires, they should be at 41 psi (normal load) or 45 (maximum load).
If you have 21" rear tires, they should be 41 psi (normal load) or 43 (maximum load).
As I noted in my earlier posting, this is not how I interpret the third placard. (In my earlier post, I mistakenly said "second placard.) I interpret the third placard as having information for both 20" and 21" tires, regardless of which size(s) your car has (and whether or not the sizes are staggered).
Originally Posted by ua549
275/45 R21 (square, std load) and 275/45 R21 XL (square).
Note that only the third placard mentions "XL". The first and second placards do not.
Yes, this is MB recommended tire pressure (both tire options are XL-Extra Load rated due to your car weight as shown on your tire sidewall):
Originally Posted by finlayson
The front tires should be at 41 psi (normal load) or 47 psi (maximum load), regardless of whether they're 20" or 21".
If you have 20" rear tires, they should be at 41 psi (normal load) or 45 (maximum load).
If you have 21" rear tires, they should be 41 psi (normal load) or 43 (maximum load).
As I noted in my earlier posting, this is not how I interpret the third placard. (In my earlier post, I mistakenly said "second placard.) I interpret the third placard as having information for both 20" and 21" tires, regardless of which size(s) your car has (and whether or not the sizes are staggered).
Note that only the third placard mentions "XL". The first and second placards do not.
10-24-2022, 12:45 AM
