Tire pressure
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From: Westchester County, NY
‘15 C300 4M Sport, ‘20 GLC300
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'20 GLC300 SUV
36 is for winter tires on 18" wheels, as I understand it.
Someone explained to me that the pressures associated with the M+S symbol on the fuel door are for proper snow tires, not all-season tires.
When I took delivery, the dealer had my tires at 41 psi all around (18" all-season RFTs). I can't remember what is on the fuel door.
Someone explained to me that the pressures associated with the M+S symbol on the fuel door are for proper snow tires, not all-season tires.
When I took delivery, the dealer had my tires at 41 psi all around (18" all-season RFTs). I can't remember what is on the fuel door.
Super Member
Joined: Mar 2018
Posts: 740
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From: Westchester County, NY
‘15 C300 4M Sport, ‘20 GLC300
36 is for winter tires on 18" wheels, as I understand it.
Someone explained to me that the pressures associated with the M+S symbol on the fuel door are for proper snow tires, not all-season tires.
When I took delivery, the dealer had my tires at 41 psi all around (18" all-season RFTs). I can't remember what is on the fuel door.
Someone explained to me that the pressures associated with the M+S symbol on the fuel door are for proper snow tires, not all-season tires.
When I took delivery, the dealer had my tires at 41 psi all around (18" all-season RFTs). I can't remember what is on the fuel door.
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'20 GLC300 SUV
Not sure what you were trying to share there.
To clarify, I was just stating that I couldn’t remember what the various values were on my ‘20 C43. Only that they were different than my ‘18 C43, and also different from the values on the fuel door of a family member’s ‘17 C300 that has the same exact size and model of 18-inch RFTs.
Last edited by zibby43; Aug 11, 2020 at 02:20 AM.
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C190
Thats a generic fuel door info. page.
Not sure what you were trying to share there.
To clarify, I was just stating that I couldn’t remember what the various values were on my ‘20 C43. Only that they were different than my ‘18 C43, and also different from the values on the fuel door of a family member’s ‘17 C300 that has the same exact size and model of 18-inch RFTs.
Not sure what you were trying to share there.
To clarify, I was just stating that I couldn’t remember what the various values were on my ‘20 C43. Only that they were different than my ‘18 C43, and also different from the values on the fuel door of a family member’s ‘17 C300 that has the same exact size and model of 18-inch RFTs.
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Thats a generic fuel door info. page.
Not sure what you were trying to share there.
To clarify, I was just stating that I couldn’t remember what the various values were on my ‘20 C43. Only that they were different than my ‘18 C43, and also different from the values on the fuel door of a family member’s ‘17 C300 that has the same exact size and model of 18-inch RFTs.
Not sure what you were trying to share there.
To clarify, I was just stating that I couldn’t remember what the various values were on my ‘20 C43. Only that they were different than my ‘18 C43, and also different from the values on the fuel door of a family member’s ‘17 C300 that has the same exact size and model of 18-inch RFTs.
this car seems pretty forgiving on specific pressures. I ran anywhere from 36 - 43 up front and tire wear was more or less the same. I always keep the rear 2 - 4 psi shy of what the front is set to.
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Junior Member
Joined: Sep 2017
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C43 cabrio
c300 doesn't have a v6 upfront - weight/load change necessary pressures.
this car seems pretty forgiving on specific pressures. I ran anywhere from 36 - 43 up front and tire wear was more or less the same. I always keep the rear 2 - 4 psi shy of what the front is set to.
this car seems pretty forgiving on specific pressures. I ran anywhere from 36 - 43 up front and tire wear was more or less the same. I always keep the rear 2 - 4 psi shy of what the front is set to.
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From: Orange County, CA
GLA250 4Matic, 911 Carrera S, R1250 GS Adv.
The M-B recommended pressures are for the runflat tires. Many, including myself, have dumped the runflats for conventional tires. I suspect there'd be a different recommendation for this different tire type, but I don't know what it would be. (And that's not really the OP's question - a minor hijack).
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From: the Right coast
'19 C43
That's for the sedan, with the 18 inch run flats. Those recommendations come right off the fuel door, for two occupants and normal cargo load. Rear pressure recommendations go up for more passengers or more cargo weight. Ran that with the run-flats, and tire wear seems normal. On non-runflats, I ran 37 front, 36 rear, and had no issues.
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2021 M550i
That's for the sedan, with the 18 inch run flats. Those recommendations come right off the fuel door, for two occupants and normal cargo load. Rear pressure recommendations go up for more passengers or more cargo weight. Ran that with the run-flats, and tire wear seems normal. On non-runflats, I ran 37 front, 36 rear, and had no issues.
What year is your sedan? I have a 2020 and it shows 36 for front and 35 for rear, for 2 with normal load.
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Audi
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From: the Right coast
'19 C43
Mine is a 2019. That 36f 35r that you are seeing...is that next to the M+S rating. That rating isn't for the 18" runflats, but for snow tires (though just fine for any non-runflats really). The ratings for 18" and 19" runflats are different on my fuel door, and I'd be really surprised if that drastically different for the 2020 models.
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C43
Tire pressure can change drastically depending on outside temperature. For the 2020 C43 specifically on stock tires, I run 35 rear and 37 front. In 90 degrees+ weather in California right now, the pressure goes up to 38 rear and 40 front after about 15-20 minutes of driving, which is where I want it to be at. Depending on the driving characteristics that you want, I believe these numbers can be flexible anywhere between 1-2psi and it shouldn't be an issue. In winter, I assume I will do 37 rear and 39 front since I don't expect the tires to heat up as much.
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2021 M550i
Mine is a 2019. That 36f 35r that you are seeing...is that next to the M+S rating. That rating isn't for the 18" runflats, but for snow tires (though just fine for any non-runflats really). The ratings for 18" and 19" runflats are different on my fuel door, and I'd be really surprised if that drastically different for the 2020 models.
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From: the Right coast
'19 C43
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Joined: Oct 2017
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2021 M550i
hmmm,...wondering if your sticker was applied as a mistake? I do recall the coupe having quite a spread between the front and rear tires - but I do not have a picture of it. Anyone else can share/check on this post already?
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'20 GLC300 SUV
The C43 tire pressure question is one of the greatest mysteries of the universe.
My 2018 sedan’s fuel door had entirely different pressure recommendations than my ‘20 does. Not surprising for some reasons. And my ‘20 has the same 18” Conti all-season RFTs.
May go through my photos to see if I can post a comparison.
Some people say that the R18 values on the fuel door apply to cars with the all-season (AS) runflat tires (RFTs).
But my AS RFTs have the M+S symbol. Some have said that the M+S symbol on the door only applies to “true” winter tires.
If that’s the case, that’s a confusing decision by Merc to not distinguish as such, as on my ‘18, I assumed that the M+S values were what I should follow. So I ran 36 all around and got good wear.
Dealer pumped me up to 41 PSI all around when I took delivery of the ‘20 in February. I’m letting that come down now (only have 500 miles).
And I want to know whether I should stay at 39 all around or lower to 36 F, 35 R.
My 2018 sedan’s fuel door had entirely different pressure recommendations than my ‘20 does. Not surprising for some reasons. And my ‘20 has the same 18” Conti all-season RFTs.
May go through my photos to see if I can post a comparison.
Some people say that the R18 values on the fuel door apply to cars with the all-season (AS) runflat tires (RFTs).
But my AS RFTs have the M+S symbol. Some have said that the M+S symbol on the door only applies to “true” winter tires.
If that’s the case, that’s a confusing decision by Merc to not distinguish as such, as on my ‘18, I assumed that the M+S values were what I should follow. So I ran 36 all around and got good wear.
Dealer pumped me up to 41 PSI all around when I took delivery of the ‘20 in February. I’m letting that come down now (only have 500 miles).
And I want to know whether I should stay at 39 all around or lower to 36 F, 35 R.
Last edited by zibby43; Aug 21, 2020 at 03:55 PM.
