jj18

Just had my summer tires installed on 2019 C63s coupe with stock staggered Front: 255/35/19 and Rear: 285/30/20 with Michelin PS4S.
It's set cold on 36 psi on all tires. The car is my DD, am only person in car and driven mostly as a DD.
The chart appears that it should be F: 33 and R: 32. ​​​​for my situation?
Anyone else with the same model have some input with psi. Gas cap chart below


. Thanks

LessIsMore

That's what the chart says. I have a different wheel set up so I cannot give you first hand experience.

That said, you might try slightly higher pressure in the front to see if it enhances steering sharpness, but I would set the rears no higher than the chart-recommended pressure. In fact you could probably lower the rears 1-2 psi for a little extra traction with minimal increased wear.

superswiss

Yes, 33f/32r. You are reading the chart correctly. It's what I'm running with the same setup. This is called the normal load pressure. 36 all around is if you load up the car full of passengers and cargo.

Jimmy_c63s

On my coupe 33 psi front and 32 psi rear is perfect. Nice and comfortable, absorbs the bumps nicely and still good on fuel. But one guy on this forum claims he cracked his wheels with 36 psi front and 34 psi rear and said he "blames us for the recommendation"

I don't know how he managed that considering the recommended pressures are lower than that.

Anyway, 33 front and 32 rear is good for perfect here with Sydney's bad roads and I haven't wrecked my rims so far.
But as @Sanch always says, fill up the tyres when it's cold. So first thing in the morning and you'll be good to go.

PS: Haven't seem Sanch here for a while. I think he doesn't come on much anymore. Anyone heard from him lately?

George_1992

32 psi rear and 33psi rear on my coupe too........ best

SDRider

Is the cabriolet any different than the coupe? My local dealer seems to set the tire pressures over 40psi and the tire pressure warning comes on if they’re set much below 38psi.

sinister.c63s

definitely set it on the lower side - when theyre closer to pull/overfull, the car gets super stiff and loose especially in high speed cornering.

W205-S

I run the same setup on my Coupe 33/32 but I am running a 295/30/20 on the rear. Car still seems to work very well with this setup!

tobeit

Interesting comment...the MB plate shows that for higher speeds it recommends higher pressure..

Btw, following that chart it says 46/48 for R19/20 and 4 passengers/180mph....that's like my use. I would be hesitant to go that high as the max rating on the tire is 50....

W205-S

Yes that sounds way to high to me...first of all I couldn't fit 4 people in my Coupe. Second is I ran in the mid 150's in the 1/2 mile with tires set at 33/32 and the car was very stable...even made one run with a heavy passenger and no worries!

sinister.c63s

Tried filling to 42-ish and I will never do that again. The car felt borderline dangerous and thats with new tires and alignment.

PD46AG

So, this is odd. I have a 2020 C63 S Coupe and my gas cap door chart shows 35 front and 33 rear for the exact same conditions (0 - 155mph, R19/R20 wheels, 2 passengers and one suitcase). I don't know how to upload a photo but I'm sure another 2020 Coupe owner can confirm this. As far as I know there are zero mechanical differences from the 2019 to 2020 model year, so why would they change the recommended tire pressures?

superswiss

Check the sticker in your fuel door. The cab is most likely slightly different due to its additional weight. Unfortunately, many shops inflate the tires too high. In the USA the white sticker on the B-pillar only indicates the max load pressure for the highest speed. This is due to DOT regulations stemming from the Firestone incidents in the 90s. Often shops inflate to that, because it's the safest pressure under any conditions, but leads to a terrible ride.

At speeds >155mph it's important to increase the pressure to reduce tire deflection, or the tires overheat eventually. It's no problem if you are close to the max rated pressure of the tire. That's cold pressure, too and there is a margin. You don't want your tires to overheat at those speeds. I did drive my car in Germany during my ED trip. Going above 155 mph was rare due to the traffic, but I did increase my tire pressure to 44f/39r at first. Unfortunately, the ride became terrible and I went back down to 33f/32r. That was fine with the relative short bursts above 155 mph. I kept an eye on the tire temperatures while doing it and while they steadily got higher the longer I was above 155 mph, they never became dangerously hot and slowing down below 155 mph started to cool them down again. Do not underestimate the forces on the tires at those speeds if you drive for any prolonged time. Also keep in mind that 46f/48r is if you load the car to its max rated loaded weight. I probably wouldn't go blast down the Autobahn at 180 mph with a car that heavily loaded in the first place.

That is indeed odd. Definitely would like to see your sticker. You can just attach the picture. Click on "Go Advanced' if you are not already using the advanced editor and then you should see a "Manage Attachments" button. What tires came on your car?

PD46AG

Here it is. BTW....the sticker on the driver side door jamb says 44 front and 45 rear which matches the fully loaded 180 mph specs on the gas cap door, so they didn't just put the wrong sticker on the gas cap door. That's really odd too because it's LOWER than the 2019 sticker posted by W205, while some of the other pressures are higher. This all leads me to conclude that you can use pretty much whatever tire pressure you like between 31 and 40 and just go about your business. Ha.

Jimmy_c63s

That's definitely different. Did you chose the High Performance AMG Tire option (Sport Cup 2's)?

Here's mine from 2017 C63s Coupe:

PD46AG

No, and I bet you just solved the mystery. Mine came with the "standard" 19/20 inch Michelin Pilot Super Sports. Perhaps yours and W205's both came with the Sport Cup 2s which require different pressures and stickers. Wow, so many freaking variables with these things. No wonder the dealers have started asking for your VIN before they even attempt to answer any technical questions.

Jimmy_c63s

Nope, mine came with the Pilot Super Sports too!
The plot thickens!

superswiss

Yeah, that's weird! Some of the recommended pressures are higher, but others are lower. @PD46AG Which exact wheels do you have, and do you by any chance have the carbon ceramic brakes?

SDRider

Mine has the 19" wheels/tires so it looks like 38F/39R is the correct pressure for max loading. I think I'm going to go with the 2 person recommendation though as the ride is pretty stiff at almost 40psi and I never have more than one other person in the car with me and I never hit speeds over 120mph. My car has Continental ContiSportContact tires 255/35ZR19 Front 285/30ZR19 Rear and the AMG 19" Forged Cross-Spoke wheels in silver.

PD46AG

Option Code 767 19" Front/20" Rear AMG Forged Cross-Spoke Wheels, Black. Standard brakes, not carbon ceramic. We need another 2020 Coupe owner with same wheels and tires to chime in here.

superswiss

Yep, lets see if somebody else with a 2020 Coupe can confirm this. Rather strange. I'm not getting the feeling that my tire pressure should be higher than 33f/32r, but I did feel the higher pressure for higher speeds were a bit rough and actually made the car somewhat scary. I'm now wondering if 2019s accidentally got the wrong sticker, because the recommended pressures seem to be the same as for the pre-FL. Given that the FL has a revised suspension with lower spring rates, that is kinda odd now that I'm thinking about it. This might be something worth contacting MBUSA about and get some clarification from Germany if it turns out that all 2020s have the same sticker as yours.

///Bruce

My son and I were struggling to determine correct (or, in this case, the generally used...) tire pressures for my new 2020 C63S coupe with 19/20 setup as well as my wife's old car/son's 'new' 2013 C63 coupe with 18/18 setup. His, it was determined FOR ONLY ONE DRIVER, should be 39/41 cold. However, on mine, there are two locations on the car to find this info. One chart is on the inside of the front door jam. The other is inside the gas cap lid. They are very different from each other. Most of you seem to gravitate towards a 33/32 pressure cold for one driver. This is what the gas cap lid says to run. However, inside the front door it says to run them at 44/45 with 4 people in the car. It does not give you any other numbers vs. capacity. Only at fully loaded capacity. I'll be dropping the pressure down later today when the heat of the day goes down.

jj18

I posted here looking for correct tire psi. for my 2019 C63s coupe with staggered 19/20, and advised to set at my gas cap saying F:33 and rear:32 for 1 driver.
Another post here said on his 2020 C63s coupe his gas cap for 1 driver listed F:35 and R:33.
This added some concern why the difference between 2019 and 2020
Glad you listed your 2020 tire psi that is the same as the 2019.



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Klinh

That’s where I has mine set at all time. Give up a little bit of softness in ride but it the safest tire pressure just I case someone want to race you 😄

elitex

After trying few psi combos, to me 37/34 is a pretty good setup.