W222 S550 spare tire
 

Do a search... Lots of discussions on solutions. W221 Spare will work on a W222. However if you have staggered wheels, ya may have to do some swapping depending on where you get the flat. There is no way to mount in trunk. You will have to fabricate your own way to mount or just have it float around.
General Understanding ….
I have personally been thinking of going with Full Summer (Non Extended Mobility) Not Run Flats, separate discussion.... and full Winter Tires since I am in the NY area. However, I am stuck with the following.....
1. Stay with Extended Mobility All Season Tires Rougher ride, great steering response, risk damaging rims due to stiff sidewalls, no need to extra set of rims, no need to swap tires, long tread life, good balance in Dry/Wet/Snow conditions.
2. Get Winter Extended Mobility Tires and Summer Extended Mobility Tires. Stiff ride, Noisy, short tread life, (Winter, BEST FOR DRIVING IN SNOW AND SLUSH ( Almost 50% better in Traction and STOPPING distances.) Summer, BEST FOR DRIVING IN DRY/WET ( Almost 50% better in Traction and STOPPING distances ) Risk of damaging Rims due to Stiffer Side Wall.
3. Get a W221 Spare, eat up limited trunk space, Install Standard All Season
4. Get a W221 Spare, eat up limited trunk space, Use Non Extended Mobility Summer tires, *** However, they are noisier, and have thicker side walls and minimum useful thread life.
. . . and the stories, comments will go on and on and on and on....
Bottom line...…. Its a Personal Choice once you have all the data.
If stopping distances are most important, True Summer/Winter Extended Mobility or not.
If Noise / Comfort is most important, Non Extended Mobility, Non Dedicated Summer/Winter
If Rim Damage is biggest concern, Non Extended Mobility, Non Dedicated Summer
Yadda, Yadda, Yadda...

The above is my general observation from reading through tons of Zero's and One's...

Now, lets get the Nitro Fill going again...
Extended Mobility Tires are not Run-Flat
https://www.tirerack.com/tires/tiret...jsp?techid=234
:nix:

I have been a Mercedes addict for a while. Now there is neither a spare tire nor a CD player in the Sedans.
Goodbye Mercedes. My new car list now has BMW, Audi, and Genesis models which I research as my hobby.
I'll insist on a spare and a CD player and probably get run flats also when it is time to buy.

If you're an old school Mercedes person like me, the A8 will quickly end up on the top of your list. Even with the B&O Advanced 3D sound system with 1920W and 24 speakers (IIRC), even with that, there's a spare tire underneath the trunk floor.

Looks great (better than S) except for $. Also no CD player in 2019. I'll look at used.

Been driving on runflat tires since 1999. Have had two punctures - both repairable - after driving to a tire store.

If you must drive further than 50 miles to reach help, do so. The downside is the distance driven beyond 50 miles reduces the probability the tire can be repaired.

Currently running on Bridgestone Drive Guards. Very satisfied with them. But the best part is knowing I will never be disabled on the hard shoulder, lying on my back with semi-trucks passing by three feet away at 70 mph. Damm scary! https://mbworld.org/forums/images/icons/icon8.gif

I take some nice trips once in a while in my s class and dont want to wait for anyone in case i get a flat. I have the same setup as steamliner. spare in trunk w full 221 jack kit.

i took mine from my 221 but if you dont have one try to get the compact one from an s63.

This, unfortunately, is my answer too. The #1 recommendation I have is to try for smaller rims when you are buying your car (19 incher). You're asking for trouble if you go for the larger rims which are more likely to land you with a flat. You can get a spare on eBay for 150-200 bucks. And a spare kit (jack, lug wrench) for another 100. But the amazing ride comfort on a Michelin Pilot Sport A/S 3+ is worth it.

I also considered the Audi A8 with the standard tires and spare in the trunk. But the reported history of catastrophic engine failure/ turbo issues with the Audi 4.0L turbo engine (which apparently has been remedied after 2016) kept me from pulling the trigger.

yes i think that would be a good idea. Im embarrassed to post a pic of my trunk...Its a mess! lol

Hello all,
I am in the process of buying a new 560 and have been doing the usual forum searches and such.
My .02, we have had 3 incidents of an unserviceable tire damage in our family over the last 50 years.
I have plugged a tire about 8 times, usually a slow leak from a nail or such.
I usually swap out run flats for non run flats when the RFs need replacement.
I do carry a small compressor and tire plug kit in the trunk.
If a spare tire is available from the manufacturer, I get one. Used that about 3 times in the last 50 years.
I don't think it is necessary to sacrifice trunk space to carry a spare............

I have been driving for over 50 years now and have never been stranded with a tire issue! I did get a nail in one tire but TPMS allowed me to get it plugged before it went flat. When my RF tires wear down I plan to replace with conventional. I do carry a pump and plug kit in my trunk.

so interesting, wife came back from work w a flat, no idea how she drove on it sidewalls gone now. Call up my tire place and ..... conti dws 315-35-20 on national backorder! yea fuk me! tires have low miles on them as I put them on last year. Luckily found a new one on ebay after calling everywhere will be here in a few days but until then ill use the spare. Thankfully I sourced it when i bought the truck a few years ago, turns a prblm not into a prblm. So this was for my x5 but easily could have been any of my cars.
https://cimg5.ibsrv.net/gimg/www.mbw...d297be456b.jpg
https://cimg1.ibsrv.net/gimg/www.mbw...70794410e5.jpg
https://cimg5.ibsrv.net/gimg/www.mbw...96914ac47e.jpg

Aren't women great??! My wife did the same thing twice. We recently counted all the rims she curbed in the last 15 years......11 !! After my last explosion 4 years ago she never asks to take my car anywhere for any reason now. LOL Works for me. She hasn't curbed a rim in 4 years...I feel blessed!! Sucks when it's a low mile tire. Good luck

yea does suk... the " new tire" i bought on ebay was date coded 2011 so I cancelled that..... Id like to keep the conti dws all around so ill keep looking.. measured my current which is at 8/32...