Tire Fitment for W212 and 19" wheels

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Jul 11, 2014 | 05:25 PM

PGT

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From: Leesburg, VA

2014 E550 4Matic with P1/LED/Pano

Tire Fitment for W212 and 19" wheels

For my 2014 E550 4Matic, I picked up some optional 19" wheels with these specs:

19x8.5ET35
19x9.5ET46

I'd like to order rubber soon and need some feedback. I'm leaning towards Michelin PSS, Bridgestone S04's or Goodyear Asymmetric 2.

245/35 or 255/35 up front?
275/30 or 285/30 in the rear?

Stock OD is 25.7 inches and recommended sizes are 247/275 for the optional AMG 19" set. These wheels sit about 12mm outboard from stock 18" set. Two goals:

* Maintain OD front to rear if possible
* No fitment issues

Feedback?

Jul 11, 2014 | 05:44 PM

threeMBs

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If your priority is to maintain identical to factory AND identical front and rear diameters, then 245/35 and 285/30. However, if you want to maintain proper load while still staying close enough (but not identical) front to rear diameter (well within 0.3" which is perfectly fine) then 255/35 and 285/30. No fitment issues with either pairing.

Jul 11, 2014 | 05:52 PM

PGT

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From: Leesburg, VA

2014 E550 4Matic with P1/LED/Pano

Thanks. I know the tire sizes are good it's the combo of those and the 12mm outboard position and whether that gets close to the fenders.

Jul 11, 2014 | 05:58 PM

threeMBs

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Quote:

Originally Posted by PGT

Thanks. I know the tire sizes are good it's the combo of those and the 12mm outboard position and whether that gets close to the fenders.

With et46 285/30 on 9.5" wheel is really not close to fender (its not fender flush by at least 5 mm). However, with et35 255/35 on 8.5" is fender flush, but not rubbing on stock hight (if it concerns you go with 245/35 but run at least 40 psi).

Jul 11, 2014 | 07:41 PM

Need4Speed

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From: Glendale, CA

2018 C63S

For the sizes mentioned I would recommend the following

245/35/19
285/30/19

Jul 11, 2014 | 07:47 PM

PGT

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Joined: May 2010

Posts: 684

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From: Leesburg, VA

2014 E550 4Matic with P1/LED/Pano

Quote:

Originally Posted by threeMBs

(if it concerns you go with 245/35 but run at least 40 psi).

I do run higher pressure but why would it be necessary? 245/ is the stock width and I'd get an XL load rating (per OEM guidelines)

Quote:

Originally Posted by Need4Speed

For the sizes mentioned I would recommend the following

245/35/19
285/30/19

thanks....leaning that way.

Jul 11, 2014 | 08:55 PM

threeMBs

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Quote:

Originally Posted by PGT

I do run higher pressure but why would it be necessary? 245/ is the stock width and I'd get an XL load rating (per OEM guidelines)

It has nothing to do with tire's width.

Your stock tires (245/40-18) are 97 XL - recommended (supplied on the car's stickers) front tire pressure is 38 (rear also 38) and 39 fully loaded (rear 44).

245/35-19 are only 93 (XL version), while 255/35-19 are 96XL. (285/30 rear are 99XL so you're fine). Your car weights over 4400 lbs unloaded. If you'll install 93XL you should compensate by running a higher pressure (I have 255/35 and run 40-41, for 245/35 I would run not less than 43).

FYI: MB builds-in into every 4matic car about .3" tolerance to account for uneven tread wear. So 255/285 is only .2" - within the window - and will maintain stock like tire loads. If you think you might have a problem with transfer case by running 255/285 and MB will deny warranty let me assure you that 245/285 will result in the same response from MB. Just keep your stock wheels and should you have any issues (extremely unlikely) with whatever you choose to install, swap originals back on prior to taking the car in.

Last edited by threeMBs; Jul 11, 2014 at 08:58 PM.