Front: 275/45R21 38lbs

Rear: 315/40R21 33lbs

 

My guess would be thats why, the wider rear tires can spread load better on lower pressures...and the lower pressures will give a better ride.

 

Thanks for your insight. Much appreciated.

Back to original topic: when I took delivery of my 24 GLE53 last year, tire pressures by dealer were set according to high performance tire standards and the ride was very harsh, so much so that my wife complained that “this thing rides like a truck”! Ugh- $95,000 and she doesn’t like it!


Then I noticed values on gas flapper door for M+S tires (which I have) and I lowered pressure to M+S standards as listed (per above photo). Voila, the ride was much less hash and steering seemed to be better as well. As usual YMMV.

 

The difference in the ride is huge when the pressures are set right...

 

It's not unusual for front engined cars to need more front pressure.

Mercedes seems to have more rear roll resistance with the 167 chassis than the 166.
It sure handles better, and the recommended pressures are appropriate.

 

Seriously, why do you ignore the information provided on this thread?
So we don't have to keep repeating?

I was ordering new tires today, and I asked (for you) what manufacturers use the gas flap.
They said Mercedes and Porsche, but not all models. And perhaps some other Euro brands that they don't see very often.

Please don't argue. If you don't believe the posts, do your own work and report your findings.

 

Because information that is presented in the thread is not always accurate. If all auto manufacturers don’t reflect it the same way, then it is obviously not because of federal regulations because those would apply to all manufacturers. That’s logic so that explanation is clearly not the reason. If you don’t know why Mercedes does this, and apparently Porsche, you just have to say that. I don’t know which is why I’m asking if anybody does know.

I’m going to listen to the PMs I’ve gotten and just let you go back to talking to yourself

I think this is interesting so if anybody else has any thoughts or answers as to why MB does I’d love to know. Has anybody else ever had another make of car that displays all these different options for tire pressure?

This is the door placard on my S560:



And on our Pacifica:



Clearly they are the same format sticker, which is obviously federally mandated. But, as you can see the S560's pressures listed there are max pressures, and the pressures listed by Chrysler on the Pacifica are clearly not. Here is the fuel door flap on the S560 showing that they want me to run 35:



So thats my question, why does MB do it this way since its clearly not a federal mandate...it may just be because they want to maximize performance in different load and speed configurations? Meaning they don't want to pigeonhole people into using the max pressures if they aren't fully loaded and driving more than 100 MPH?

 

The fed regulation is a one size fits all situations tire pressure and is required to be on the door jam. It is a compromise catering to the lowest common denominator. For those who like to extract the maximums (comfort or performance) from their vehicles, tire pressures can be adjusted up or down depending on the load, tire compound, temperature, and intended use. MB Chooses to give their recommendations for this on the gas door. I'm not sure why this seems to be such a complicated concept.

 

It clearly creates confusion...even with dealers using the pressure on the door frame

 

Yes it does indeed. Maybe I'm biased, but it's been a while since I'd consider a dealer tech educated in all manner of vehicle engineering though. They're parts changers trained to minimize losses from mistakes and law suits. There are of course good ones, but I believe they are the exception. The people I want to ask questions of are the MB engineers, but of course that will never happen.

 

Oh, I agree 100% lol

 

I'm proud to report that I can decipher a gas flap!😀