Any tips to improve the harsh ride i've got the 19 inch rims and the ride is horrible

 

Which suspension do you have? As far as I can see, the C300 is available with different suspensions in your neck of the woods. Two of them are adaptive and can be controlled by selecting the appropriate mode. The sport suspension will be firmer and doesn't have manual control over the mode. The selective damping system in the sport suspension has two damper settings, but it selects them automatically based on the amount of movement it detects in the body, so for normal straight line driving the dampers go into the comfort setting and when you start cornering somewhat spirited, they switch to the firmer sporty setting, but as a driver other than with your driving style, you don't have any control over it. The sport suspension is inherently firmer as it prioritizes handling over comfort. That's also reflected by sitting 15 millimeters lower.

So, I guess the most obvious response would be to option the correct suspension for your style of driving, but now that you have the car already, that's no longer an option. The most impactful change you can make to the ride is using the correct tire pressure. There are several tire pressures for different load, tire and speed situations. Usually listed on a sticker inside of the fuel door. So for normal driving mostly by yourself, you wanna use what's referred to as the normal load tire pressure. It's the lowest tire pressure for normal driving with 1-2 occupants and mostly empty trunk. If you use the highest tire pressure known as the max load pressure and you don't load the car up with passengers and cargo, you will have a harsh ride.

Having said all that, it occasionally happens that dealerships forget to remove the shipping blocks during PDI. The shipping blocks are used during transportation to avoid the car from swaying around. They prevent the springs from compressing. So, if they are still in, you'll have a horrible ride as a result. They are usually brightly colored plastic pieces in the springs that you can spot by looking at the suspension.

 

Get rid of the sporty wheels! Get smaller diameter wheels, higher aspect ratio tires, lower tire pressure, lower speed rated tires (less stiff sidewalls), new rubber bushings, new shocks, and only drive on smooth, newly paved roads. If none of that works get a big cushion for your seat, or a new car or an suv with fat tires!

 

I would start with tire pressure. Car manufacturers love to run higher PSI in order to obtain maximum MPG.

 

I have my ups and downs with our 2023 C300 with 19" AMG wheels but the ride isn't one of them.

 

Also, some tires are more comfortable than others. Old tires can be less comfortable.

 

I've got the amg sport suspension without the adaptive dampers on goodyear eagle f1s and i've got the tyres pumped up as low as they can without turning the tyre pressure light which is 245KPA but im still finding it stiff especially on uneven roads the car rocks so firm left and right

 

First, 245 kpa, 35 psi to me, is too high for comfort. My tires are supposed to be 36 psi, during the winter I go to 32 or 33, but that is for a 245,40,19, and i have to be careful to avoid potholes. What is your full tire size? You can adjust when the warning light comes on. You do not say how many miles on the car. Maybe need new shocks, or replace shocks and springs to turn it into non sport suspension? I had an E350 coupe with sport suspension that could not be modified. Very rough ride especially in the winter. I had to sell it to regain my sanity.

 

That's your problem right there. The sport suspension is about handling and fun cornering, not comfort. I don't know what the tire pressure is supposed to be on this car. Can you post a picture of the sticker inside of the fuel door? Once you lowered it to the desired pressures, you just need to reset TPMS, so the tire pressure warning doesn't come on. There's no predefined tire pressure in TPMS. You have to store the reference values yourself after setting the pressure to what you want them to be.

 

I'm not trying to risk breaking my rims just for a bit of comfort also my car is fairly new it has 36k KM or 15 k miles i think, maybe i should follow you and sell it to regain my sanity LOL

 

What's making me mad is that my dealer never mentioned any type of different suspensions when I was ordering mine, also I'm afraid of lowering the tire pressure because that will put my rims in high risk

 

In both my 22 and 25 without amg suspension, the tires came over-inflated from the dealer. The fuel cap suggests 37 psi for all wheels.

After lowering my PSI, I found the ride to be much more comfortable. All the little jolts and bumps were gone. Also, if you have run-flats, I would suggest replacing them for superior comfort. After I swapped the run flats on my 22 for michelin all seasons, there was an immediate softening of the ride. My 25 did not have run flats and it was much more comfortable from the start.

 

But how do I know that i got run flats cuz i went to 4 mechanics two of them told me i had run flats while the others said i don't. Also does having a spare tire mean that i definitely don't have run flats ?

 

Check the sidewall, it will say Run-Flat or RFT depending on the tire brand.

 

You can see for yourself because i didn't find anything

 

Go to tirerack.com and compare the sidewalls of the regular or runonflat asymetrico 5's. To my eye, your tire matches the pic of the runonflat. They are different designs and you should be able to tell with the tire right in front of you.

 

I disagree i think mine looks more like the nonrunflats because of the lack of a star symbol that the runflats has

 

Maybe that star symbol is a snowflake? which means a tire rated for snow...very hard to see in those pics

 

IDK but is there a way to know for sure ?

 

Might be easier to read a tire that is clean. You may need to apply some tire goo to be able to read it. A goodyear dealer would know. Or, stick a knife in it to see if it goes flat. 😏 Having factory spare likely indicates non runflat. You would maximize comfort with smaller diameter wheel and higher profile tire, and this is cheaper than the transaction cost for a new car.

 

Those are the non runflat tires. Runflat would say MOE on the sidewall instead of MO.

MOE = Mercedes-Benz Original Extended (MB's way of saying runflat)
MO - Mercedes-Benz Original

 

Oh yes good eye yes it says MO in the first picture.

 

These are the original factory tires that also came with my 2025. They are NOT run-flat. Did you receive a tirefit kit? It should be a black bag with straps hooked in the trunk containing a tire pump and a bottle of sealant. These are included in non-run flat equipped models.

What is your psi? I find these tires to be very comfortable on my 25, a major step up from the 22 overall.

 

You can see the details, we can not. I am basing it on the greater design and construction since the symbols can change. I was looking at the flagging around the eagle sign that is on a diagonal and the smooth sidewall. Maybe try typing in any batch numbers or emailing them as they will likely be responsive, but looks like the poster above has your answer.

 

I do have a tirekit so it seems that they are non runflats, also im running about 37 psi on my tires im afraid to go any lower as that will risk breaking my rims