New guy Questions about the sClass trunk
Out Of Control!!
Joined: Nov 2018
Posts: 11,462
Likes: 5,354
From: San Francisco Bay Area
2019 C63CS
Happened to me while driving the 221 S-65. 110 degrees of ambient. Middle of the day tarmac will burn bare feet in seconds of an ‘Ouch-ouch-ouch-ouch’ run across it. Tires were a year old and just over half worn. 80mph is speed of traffic. All is smooth... a vibration in steering for ten seconds.... About the time I selected tire pressure in the dash I hear the right front come apart. Tire parts rattling under the car and seen in the rear view, it is pulling right. Get it to the shoulder for a shredded tire and R/F fender liner. This is how I learned about the flimsy space saver spare (mounted on an aluminum space saver spare wheel that cleared brakes) the 221 S-65 was equipped with. But it had a spare.
Thank you for the clarification about MB Roadside assistance. ‘You have to buy the repair at MB or they may charge for the tow.’
Thank you for the clarification about MB Roadside assistance. ‘You have to buy the repair at MB or they may charge for the tow.’
Ultimately, it comes down to proper equipment. For example don’t drive on AS tires in that kind of heat as their peak temps are much lower at around 130F
Last edited by superswiss; Dec 28, 2025 at 02:17 PM.
MBWorld Fanatic!
Joined: Feb 2003
Posts: 1,416
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From: Charlotte, NC
Had: 1987 300TD, Had: 2004 C230 Sport Sedan, Have: 2014 E350 Sport, Have: 2019 S450
Most likely wrong tire pressure. Performance tires for example can take up to 200F, but you must lower the cold tire pressure as at those temps the pressures rise quite high. Tire pressure goes up by 1 psi for each 10F and at some point you’ll exceed the max pressure the tire can handle, usually around 50 psi. That’s why when doing track days one starts at lower pressure compared to the street. I always keep the pressure and temperatures up in the instrument cluster even on the street. I partly do that to know when the rear tires are warm enough to have proper grip, but also to make sure pressures and temperatures are not exceeding their design parameters before anything happens.
This is why I’m willing to sacrifice some trunk space to carry a spare.
Out Of Control!!
Joined: Nov 2018
Posts: 11,462
Likes: 5,354
From: San Francisco Bay Area
2019 C63CS
The fallacy is thinking that all flats are due to small punctures. If the flat is caused by striking road debris (ladder, brick, steel bars), the sidewall of even an MOE tire will be damaged to where it is no longer runflat. At that point you’re waiting for a flatbed, likely for hours, if you are without a spare. A co-worker with an E350’on MOE’s waited 3 hours on the roadside just outside Charlotte after running over a piece of debris which fell from the truck in front of him.
This is why I’m willing to sacrifice some trunk space to carry a spare.
This is why I’m willing to sacrifice some trunk space to carry a spare.
Last edited by superswiss; Dec 28, 2025 at 04:32 PM.
Member
Joined: Jan 2016
Posts: 112
Likes: 33
From: Mt Pleasant, SC
2018 S560
My W221 S63 had a spare tire, but I removed it for my audio install. That's a great spot for a subwoofer enclosure. 
The spare tire in that car was a donut anyway. While I know how to change a tire, I'm just not going to do it in most cases. I'll just get the car towed, if necessary.
Funny thing.... I owned that W221 for about 10 years. Never once needed that spare. Then I sold the car to a buddy of mine who lived out of state. He flew down to pick it up and drive home.
He bought the car with the stereo included (he is actually my business partner in an audio business). So I gave him the spare tire which I saved in my garage. He put the spare in the back seat for the drive home.
Not 1 hour outside of town, a truck dropped some piece of debris in front of him and he had an instant blowout. He changed to the spare tire, but the spare was also flat. Years of sitting in my garage and we didn't think to put air in it before he left.
So he still ended up getting a tow truck.
My W222 did not come with a spare. My 2023 Audi R8 did not come with a spare. My old 2020 BMW M5 did not come with a spare. Seems like a lot of the German companies are leaving spares out these days.
The spare tire in that car was a donut anyway. While I know how to change a tire, I'm just not going to do it in most cases. I'll just get the car towed, if necessary.
Funny thing.... I owned that W221 for about 10 years. Never once needed that spare. Then I sold the car to a buddy of mine who lived out of state. He flew down to pick it up and drive home.
He bought the car with the stereo included (he is actually my business partner in an audio business). So I gave him the spare tire which I saved in my garage. He put the spare in the back seat for the drive home.
Not 1 hour outside of town, a truck dropped some piece of debris in front of him and he had an instant blowout. He changed to the spare tire, but the spare was also flat. Years of sitting in my garage and we didn't think to put air in it before he left.
So he still ended up getting a tow truck.
My W222 did not come with a spare. My 2023 Audi R8 did not come with a spare. My old 2020 BMW M5 did not come with a spare. Seems like a lot of the German companies are leaving spares out these days.
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Joined: Feb 2012
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From: Phoenix
222 S-65
