Ron.s

My Dealer got a surprise when a 2021 63 S SUV arrived with 21” wheels and Michelin All Seasons tires. They were expecting them to have the Highway tire like the 22” have. My 53 came with 275/45R21 Continental A/S Crosscontact tires. It looked like the Michelin was a Latitude Tour...275/45R21, Speed rating V. This has to be a recent addition to the Michelin line because it wasn’t listed a few weeks ago when I researched Michelin’s for that tire size. They have no information yet at the Dealer level about this change...all future 21’s? or just in Northern locations?

marchgroupinc

These tires are on many GLE and GLS in 21 inch here at my dealer. I recently purchased from my local MB dealer new Michelin Latitude Tour all season 21 inch MO spec. 275/45/21 315/40/21 to replace my summer only 22 inch set. There are 2 Michelin MO spec product codes available for each staggered size; 30098 64499, 57260, 65282 all H speed rating. BTW the ride is excellent and quiet and IMO are superior to the Continental Premium Contact 6 22 inch that came with the GLS. I hope these Michelin come in my 22 inch sizes eventually as the 21 inch are a shorter height and adds another 4% inaccuracy to my speedo. My speedo was off by 3% with the 22's and now a total of 7% off with the 21inch. I am surprised by the large circumference differences on all the tires that are available from the factory option choices on each model and no apparent way to correct speedo for tire size. All the differential ratios are the same AFAIK so depending on the optional tires you get you speedo accuracy will vary.

Ron.s

It’s my understanding that the AMG models require a Y speed rating for the higher settings for top the speed limit. There are also Pirelli tires in those sizes with H ratings. Netstar showed a highway tire for the 63 S but these came A/S.
Are you sure about your tire calculations on circumference percentages...might be off a decimal point? I have those to be very close to the same...20’s to 21 about .3% & 20’s to 22 about .8%.

GregW / Oregon

The DOG I have shows the 53 with All Seasons and the 63S with High Performance tires, so that is odd.

marchgroupinc

Here is the info I have on the sizes 22 to 21 and my speedo started off 3% too high and now is more than 7%. I confirmed this on my GPS.

Can you see where I may have wrong information?
315/40/21 dia 785mm or 30.9 " Circum 2466 or 97.1" 325/40/22 dia 818mm or 32.2" Circum 2570 mm or 101.2 difference -4.0%
275.45/21 dia. 780mm or 30.7 " Circum 2451mm or 96.5" 285/45/22 dia 815mm or 32.1" Circum 2560mm or 100.8 difference -4.4%

Some background to this change to 21 inch all season tires. - I did this size and tire to ensure MB would not have any problem with the change as I have had tire balance issues in the past and don't want an excuse to not fix the problems. I had problems with balance due to flat spotting on the 22 inch Continental Premium Contact 6 the GLS comes with. Its not a good tire for northern climates. On my prior ML with Airmatic the factory Pirelli tires would not balance at all after 3 sets attempted (with Pirelli HQ also testing 1500kms) and finally Continentals were installed and the problem was solved. (Pirelli paid for the new Continentals). I ordered the GLS580 with 21 inch to get all season tires and was forced to change the order to 22's or delay/cancel the order. I thought it would be a good move since the 22 inch tires actually have a taller sidewall but I did not anticipate that there would be no options to change the tires to all season. Going to 21 inch was the only option for an all season tire. Why they only forced Canadians (while Americans still got 21 inch All Season as standard) to opt for Summer only tires - eliminating any All Season tire option, is beyond me.

Ron.s

The front 21 is a typo shows 22”-the factory size on the 22 rear is 325/35 not 325/40. Here are the calculations for the rear tires.

Tire size 315/40-21 325/35-22

Section width 315 mm (12.4'') 325 mm (12.8'')

Sidewall 126 mm (5'') 114 mm (4.5'')

Tire diameter 785 mm (30.9'') 787 mm (31'')

R Circumference 97” 97.3” plus .3%
F Circumference 96.5. 97.3 plus .8%

The front tire 285/40R22 is also 97.3 not 100.8

marchgroupinc

Thanks Ron for the corrections. Serves me right for meddling in the tire size variances on the GLE when I have a GLS. It is interesting that the GLE AMG has the same tire size as the GLS in a 21 inch (275/45/21 315/40/21) but the 22 inch are not. The GLS is 285/45/22 325/40/22 and the GLE 285/40/22 325/35/22. The GLE sizes make more sense now you pointed out my error. I made the corrections to my post and the results are still the same for my GLS factory provided tire sizes. Sorry for the confusion. My comparison was due to the 275/45/21 Conti you have on your GLE53 and your dealer getting Michelin 275/45/21 on that 63S, so I assumed the GLE has the same size sizes as my GLS580 for other size rims. I am trying to see why the GLS has such a big difference in optional tire heights with what I believe is the same differential ratio for all tires and understand how the factory deals with the variations in the speedo. My dealer tells me anything under 10% error is acceptable to MB. I don't like the inaccuracy so I keep looking for an MB approved all season tire in the same circumference as my 22's or a method to correct the speedo.

BTW the MO spec 22 inch tires in the GLS sizes fills out the wheel well much better for anyone who prefers that.

djer

TireRack doesn't even list the Latitude Tour all seasons for any of the GLE's, and the highest speed-rating they have for the Latitude Tour HP is W-rated. Michelin's website also didn't have it listed either. Must be a really one-off tire deal MB strike with Michelin.

The Pilot Sport All Season 4 only comes with the fronts 275/45R21, hopefully they'll release the rears 315.

mikapen

Those dimensions will vary from manufacturer to manufacturer, unfortunately. That makes it an exhausting task to compare.
I really wish M-B had chosen sizes that are available today, not some imaginary time in the future.
I remember the when Michelin came out with the TRX390 special fitment - a tire that would soon become unobtanium for that specific wheel. I hope this isn't a repeat of that debacle.

Nokian has rear snows, but not the front. And the Michelin's I would hope for aren't available in either size. That leaves me stuck with a couple of brands I have tried and disliked. I don't relish spending the big bucks on tires I don't like

Ron.s

I’m a repeat offender on numbers. It seems like a lot of us will catch a typo if it’s a word but it’s often hard to catch them with numbers. Then we have spell check to add to the grief if you type a letter wrong early in a word. Maybe some of us were born in the wrong era and can’t adjust to all this Tech...😱