I got rid of my run flat tires a couple years ago an never looked back. I have a floor jack, tools, tire repair kit and pump in my trunk.

My issue is MB not giving an opinion to do so without sacrificing your trunk space. I am I my car by myself 99% of the time so I am fine with that. I still have enough space for a suitcase so not a problem

 

Found a donut spare and was about to buy it online. Before making the purchase I went outside and looked in the trunk at the well under the carpet........and saw that it does not fit (an earlier post on here motivated me to do that). Looks like that idea is history. Thanks to the earlier post that motivated me to look, you saved me a few dollars.

 

I have a full-size spare with the same rim on the car. Be careful of donuts because they can through your AWD system off due to the fact that they are different circumferences. That could end up been very costly to repair and would not be covered under any warranty since it’s not OEM to your MY.

I purchased one online and found this out afterwards so it’s just sitting I’m my garage

 

If you purchase the correct size spare the circumference will match exactly.
My car has 245/45R18 tires, 26.7" circumference, 779 revs per mile.
The spare is 135/70R19, 26.7" circumference, 779 revs per mile.

 

This is great insight, thank you so much

 

That would not seem to be a viable option if you have different sized tires on the front and rear wheels, as my car does.

 

Even with different front and rear size tires, the diameter and revs per mile should be the same all around. You can check specs for each tire on tirerack.com.

 

My tires are close in those regards, but not exact. Here's the info from TireRack for the Michelin Pilot Sport 4S tires on my car:

Front : 245/40 R19 – diameter = 26.7inches; revs = 778/mile
Rear: 275/35 R19 – diameter = 26.6 inches; revs = 783/mile

Would that be OK for a short time until the tire is replaced with a new one of the correct size?

 

I've always had slow leaks versus complete flats. Sometimes it was a bad seal on the tires or rust on the rims where they'd take the tire off, clean up the rim and reseal it and it'd be fine afterwards. With flats, when you get a nail in the tire, you get a slow leak. Usually I can put enough air in it to get to a tire shop to have it fixed. You also get slow leaks from cracked rims.

 

The dimensions you list are the OEM dimensions that RWD E-Classes ship with if you choose 19-inch wheels with performance tires. I know because those are the exact tire dimensions of the RFT Goodyear Performance Summer tires my car shipped with. They are also the dimensions of the non-RFT Michelin Pilot Sport A/S 3+ I replaced the Goodyears with. I think that's as good as it will ever get if you want to keep your staggered setup. Also, to go non-staggered, say with 245/40 R19 all around, you would have to buy new rear wheels as the staggered rear wheels are 1 inch wider than the front ones, so a 245 tire would not fit them appropriately.

 

How much better is it now that you had it for a few weeks??

 

The non-RFTs are much better. If I had it to do over I would have specified non-RFTs and a tool kit in my purchase contract with the dealer (at extra cost I'm sure).

 

Where can I find the rim for the 135/70R19 spare tire?

 

You won't find just a rim with the correct offset, etc. Purchase MB part #213-400-06-00 from your dealer or other OEM parts supplier.
Read this thread.

 

Hi Folks,

Just a note to let you know that I couldn't those damn run flats off my new 2019 E450 Wagon. The Vredestein Quatrac Pro received fantastic reviews on Tirerack and what a deal for the price! More so, the ride is phenomenal. Picked up a Mercedes spare, a2124013302, a used Mercedes tire change kit and air pump. These tires are just so comfortable and apparently only available from Tirerack unless you want to have then shipped from Europe, they're made in Holland and have been around for about a 100 years.

 

Oh, I forgot to ask, I noticed that someone had mentioned that a smaller circumferential wheel could ruin the 4matic system. The wheel I pictured is 155/60/18. If I am only using the spare to slowly get to a tire service shop, would that be safe on the 4matic?
Thanks

 

That spare is about 1.4" difference in diameter, or over 5%. MUCH larger than the maximum recommended difference. I don't know.....

 

Thank you, could you tell me where the 'recommendations' can be found?

 

You need a spare with the same revs per mile as the 245/49R19 tires. That is 778 revs per mile (diameter 26.7"). One such compact spare is Continental CST 17 size T175/80R20. There are others with those specs as well. Make sure the wheel has the correct offset to avoid conflicts with body or brakes.

 

Hi there ua549.I'm sure you mean't 245/40/19. now would there be any major problem using my 155/60/18 to drive 3-5 miles slowly to a garage in an emergency situation? There is only a 1.25 inch diff in height and obviously different rotation levels.it is extremely hard to find a used Continental CST 17 size T175/80R20..
Thanks again

 

A discrepancy of more than a tenth of an inch is detected a wheel slippage and can will damage the transfer case.
For an authoritative answer ask your MB service agent.

 

I think that is way tighter than required. Some of the stock tire configurations are close to that. There's a previous discussion here, and I think recommended is within about 0.3", more than a tenth, but far less than the above 1.4". But yes, an authoritative answer would definitely be preferred.

 

where did you find the spare please?

 

My local MB dealer's parts counter.

 

I finally got the correct tire from Mercedes Benz. They did not have it in stock and ordered it in from Germany. Thankful to have it. Next will be replacing the RFT's. Appreciate your information and everyone else on the thread. If anyone else wants one, I posted the tire and the order sticker. I got mine from MB of Scottsdale on mbpartscenter.com. They did a great job.