Hi there,
my 2024 EQS SUV needs rear tires. I bought new tires and when installing them the shop called me and said it’s better to change all 4 even of the front are still good. I refused as I thought they were trying sell me more tires but reading on the web it looks like some places do recommend this.
I have personally on other MB including EQ models changed only 2 at a time and it was ok.
Does anyone here have any experience with EQS SUV in this situation?

Thanks!

 

I have a 23 EQS 450+ SUV and am replacing all 4 tires Monday. Last year our dealer could not find a replacement run flat and installed two non run flats. This created two problems.
One, mixing different tires is not recommended by Pirelli as they wear and handle differently.
Two, they cannot be rotated properly.
EV’s need everything in maximum condition to achieve great efficiency and 4 tires properly balanced and rotated are critical.

 

If you've been rotating your tires periodically (every 5K), why the uneven wear? Have you measured the tread depths yourself? Mixing tires -- even 2 new same brand/spec tires with 2 half worn or more -- is not something I'd do. If you need new tires, do it right. They're all that's keeping you in contact with planet earth when you're cruising at 80 mph.

 

My 2023 EQS SUV 4matic came from the factory with front tires 275/45, rear tires 285/45. That comes out to a Front-to-Rear tires difference of 9mm in diameter, 30mm in circumference. From the factory.
If the fronts are also worn and need replacement, sure replace them. Otherwise, leave it be. If your EQS has a symmetrical setup, try to rotate the tires more often going forward. If your car has an asymmetrical setup like mine did, you could consider changing to a symmetrical set of rims.

 

Have you ever asked or researched this tire size difference to confirm that it's intentional? I wonder if in the latter phase of the pandemic, supply line shortages prompted the factory to mount whatever was available.

 

My understanding is that all the EQS with third-row seating came with beefier tires in the rear to handle the possible higher Gross Vehicle Weight (2 additional rear passengers).

 

10mm of tread width unlikely changes the tire's load rating. What are the complete specs?

 

It's in the post I linked to; the OEM setups I found documentation for online:
Staggered 21":Symmetrical 20":Symmetrical 22":

 

Tire brand, model and sub-species will fill in the blanks.

 

Mine came with Pirelli Scorpion Zero All-Season Elect MO-S, not-run-flat. Lasted 34k miles. Don't know what the other options come with, but Lazaru5 mentioned Goodyear Eagle Touring RunOnFlat came with his non-staggered 21" setup.

 

I'm very close to needing new tires on my 2024 EQS 450+ SUV...with the third row.....so 275 front and 285 rear. The car came with the Goodyer Eagle F1 tires - at best...looks like I'll get 19,000 on the rear and maybe 23,000 on the front. Since the tires are not same size....plus I want all-season....plus I want a tire built for an EV....my choices are very limited.

I see you have Pirelli Scorpion tires. The Pirelli Scorpion Zero All Season tires will fit my front and rear....plus designed for an EV. I'm hoping given the Pirelli is an AS tire....I'll get a few more miles that the Eagle F1 tires. Has the Pirelli Scorpion tire worked well for you?

 

Like I said, the OEM Pirelli lasted about 34k miles. According to Tirerack, the Treadwear rating for those Goodyears is 300, while the Pirelli's is 540. So, makes sense that they last longer.
Personally, 21" tires don't have enough sidewall for the potholes in my poorly maintained city. I decided to downsize the rims from 21" to 20", and get the non-EV Pirelli's with an 800 Treadwear rating.
Interestingly, the 20" Rims + Tires cost about the same as the 21" tires alone would have. So, in addition to this new set of tires likely lasting much longer, my next tire replacement will be a lot cheaper.
I commute about 300 miles a week, so don't care much about efficiency. However, despite the non-EV Pirelli's probably having a higher rolling resistance, when combined with downsizing the rims and running 2-3 psi over recommended, I haven't noticed any significant change in range / efficiency (estimated range at 80% is still about the same). YMMV; I mostly crawl in bumper-to-bumper traffic, where maybe the tires don't impact range as much they might when doing high speed trips.

 

thanks

 

I've never had a problem with replacing two tires (or even one) at a time when all four tires are the same. Just put the best tread on the rear. You can still rotate the tires, but remember you need to put the tires with the best tread on the rear if there is a significant difference in wear.

it gets a bit trickier if the tires are different; you do not want the front to have more traction than the rear, so sometimes you have to do all four at once.

 

Replacing tires on the EQS SUV 4matic - I've had to do mine twice already and it's been a bit of a pain. The 22" AMG wheels with the 275/40R22 tires are a real challenge to switch out for winter tires, let me tell you. I ended up buying a tire changing service to avoid doing it myself.

 

Harbor Freight sells a tire dolly that lifts and rotates tires to assist in exchanging tires. HF also sells lug bolt pins that aid in hanging the wheel on the hub while mounting.
https://www.harborfreight.com/1300-l...lly-64601.html

 

Just not a practice I would adopt, recommend or approve. I keep my tires balanced and rotated every 5K miles, and they're all within 1/32" of each other, without any uneven wear. One of the reasons I took the run-flats off my X7 is that the tire manufacturer (Continental) doesn't recommend repairing punctures, but replacement. This results in one new tire and 3 maybe half worn or more tires, and starts the cascade of mismatched tires. I like to keep my life simple, and 4 matched tires is part of that.

 

The load rating is based on the tires construction, not its size.

 

Perhaps, but can you point to anything from Mercedes that says you cannot replace a single tire? Note, I don't trust a dealership service advisor on this - they are commissioned salesmen. In the manual, I see that you need to keep tires on the same axle the same size, but there is nothing that says you need to replace both tires on an axle at the same time.