I would like to go with the widest tire possible front and back. Not looking for stretching tires, not even the BMW style stretch (which I think is decent) I would like a slight bulge with nice squared shoulders on those tires. I don't really care THAT much about wheels being flush either.
ie:

The rear in this fine looking automobile is a 295 tire on a 9.5 width wheel.
I was thinking of going with a 275/35/19 on a 9.5" width wheel for the front and 305/30/19 on a 10" or 10.5 width wheel rear. I have been reading threads and searching for quite some time now and the only thing I found was a couple of old threads about w211's that have gone with 275's up front (I believe one thread was about reducing under steer and the other about going with a square set up).
My car is a 2014 e63S and I do not plan on lowering it.
Wondering if anyone out there has tried this (275 tire in a 9.5" wheel Front), if so, what offset wheels did you go with? I know that for the rear I can go somewhere from +45->50 (305/30/19 on a 10" or 10.5 Rear)
TIA for your input.

I have pretty much the same taste as you. Been down this road with PSS and now PS4S Michelins on my W212 E63 and now W218 CLS63 (same chassis').

I would definitely stick with 9" on the front on a 275/35/19. 9.5" will be too wide and will look stretched on the 275/35 for sure. You could go 265/35 TPC spec Super Sports, those are much wider and look way more square (CTS-V and Z06 tire). PS4S not offered in this spec yet.

I have only done 265/35 on my 9" fronts but want 275/35's for the same look as my 295/30 on the 9.5 rears I have. If you go 10" rears definitely go 295/30 and if you go 10.5" rears definitely go 305/30. Just be careful with your rear offset on your W212 on that 10.5 & 305/30.

These are all with the wider Michelin spec tires in mind. Other brands are vastly different as far as stretch and fitment on your car is concerned.

If you're going to run the 275/35 up front then you'd need to run the 305/30 out back. I tried to run 265s with my 305s and it threw off the programmed ratio enough to cause all kinds of handling problems due to the ESP/TC/ABS programs intervening.

I was going to try the 275/305 combo on my next set of tires but I doubt I'll have this car much longer. The 305 on a 10.5" wheel is squared much better than the 295.

Thank you for the insight. What offset is your front wheel? I have seen posts where people have done a 305 in a +45 and a +50 Rear. I might go and split that difference.... say a +48

Thank for your response as well, Chiro, I read your posts about the electronics cutting in on your driving. Have you spoken to anyone else who might have also experienced this? I do believe you asked a member who threw 315's on his CLS the same question and he replied he didn't. In any case, what are the specs on your current set up?
Thanks.

I had my tech drive it with star connected to see how much intrusion there was and he said to go down to 295 in the rear asap. He said I could probably get away with 275 up front but the 265/295 combo was a closer match to stock and what's programmed into the ecu. I can't believe it's an isolated issue with my car, I'm much more inclined to believe others are just dismissing it as a trait of wider tires. People chased these symptoms in the E55s for years when they went wider out back. Everyone assumed it was hardware and it's the reason upgraded toe links were marketed. I hope people running out of ratio specs never have to perform any high speed emergency maneuvers!!

Anyways, my current wheels are 19x9 et30 and 19x10.5 et50

I was talking about on factory 19x9 wheels with ET37 offset.

My HRE's I just got are the same exact specs (running 15mm rear spacer though on my CLS). I am assuming your issues were because of the 4MATIC 4 wheel drive on your E63? RWD models shouldn't have these problems I can't imagine.

Thank you, sir!

My logic was the same as yours but I was very wrong. I have have a 2012 RWD E63.

This was actually something I speculated, I thought you may have had a prefacelift rwd. Im now then going to assume the CLS would encounter the same problems?

For what its worth to you guys and the rest of the community, I have driven on the below specs without ANY problems that you encountered on your E.

On my 2010 (W212) E63:
OEM Forged Wheels
F 19x9 ET37 - 265/35/19 Pilot Super Sport
R 19x9.5 ET52 - 285/35/19 Pilot Super Sport

On my 2012 CLS63:
OEM Forged Wheels
F 19x9 ET37 - 265/35/19 Pilot Super Sport
R 19x10 ET32/47 - 295/30/19 Pilot Super Sport (with/without H&R 15mm spacer)
R 19x9.5 ET52 - 285/35/19 Pilot Super Sport

Replica Wheels
F 19x8.5 ET35 - 255/35/19 Pilot Sport 4S
R 19x9.5 ET35 - 295/30/19 Pilot Super Sport

HRE Wheels (just put them on yesterday)
F 19x9 ET30 - 255/35/19 Pirelli PZero
R 19x10.5 ET35 - 285/30/19 Pirelli PZero (E63S spec but added H&R 15mm spacer)

Hopefully these numbers are good reference for anyone in the future. I planned on installing F 275/35/19 PS4S and R 305/30/19 PS4S for these HRE's but am now concerned about that setup. Maybe I'll do 265/35 and 305/30?

The tires that my car currently has are also "out of spec" on stock 5 spoke wheels. I purchased this vehicle used and when I got home I realized the tires out front are All season's in 245/40/19 and the ones out back are Contis in 275/35/19. I drove from NJ to NY and I, of course, cranked her up a bit. All was fine and I have driven her a bit without any issues so far (knock on wood). I guess, maybe, just maybe, so long as you maintain that magical 30 millimeter width difference you should be OK??

I noticed the errors happen if you deviate too much PERCENTAGE wise from stock tire sizes from factory.

Difference between stock should be kept less than 2% to have no issues and that includes not just front tires versus stock but also difference between front and back.

I have the E550 and stock is 245/40/18 and I was able to try on the rears 275/35/18 and 285/35/18 with the stock fronts and no issues.

I used calculators to calculate the percentage difference and keep it low.

For 245/40/18 front and back stock.

I can try realistically widest is 275/35/18 or 285/35/18 for front.

Rears same as widest fronts for a square setup or have to be 315/30/18 or 325/30/18 with the wider fronts to have percentage difference low and widest possible with the stock fenders.

If going to 19s then minus sidewall series by 5 (example= 18s is 35 tall and 19s will be 30 tall).

For the AMG input stock tire sizes on the calculator and keep percentage below 2% I believe front to back and compared to stock from fronts and rears individually.

One thing I am not too sure if it affects 4matic systems are the offsets of wheels and if wheel widths affecting tires actual contact makes a difference.

There is also another issue of different brands of tires could make a difference if 1 brands 285 width is really wider than other brands 285 so do we treat it as 290 or 295 in the calculated percentages?

Is it all just calculated by the wheels spin rates and if its over 3% difference in spin rates (revs/mile) versus stocks and then the systems mess up?

I hear all of you. However, In the mean time... http://www.bcforged-na.com/project/mb-e63-amg-s/ 305's all 4 corners. This guy is my hero!

Huh. I wonder what the offsets are on those and how much rubbing they get.

Pretty wild. I asked about that setup and was told the front suspension is not stock. I believe he's actually with bc racing, so makes sense. Can probably call them to find out for sure.

Yes, I do believe he is with BC as the link under the pictures suggests. I'd do 305's up front if the car's body'd accommodated 325's

Yea curious on the offsets and if the coilovers in front allow more room for wider tires?

I just checked the calculator for amg stock tires to 305/25/20 and it is no difference for front.

The rear difference is only 1.2% to stock 285/30/19 so he will not have any 4matic issues using that size.

Ok. Did the 275/35/19 up front thing I was yapping about. This is what it looks like.


Another terrible pic


How close is this dirty tire to the strut?...


I think there is about 3-4mm's


The Front wheel specs are 9.5x19 ET35 + 3mm spacer (effectively +32 offset to clear tire from strut) So far the car drives pretty well with this set up in stock height (I always drive in S). I hope this bit of info can help someone who is wondering about the same.

Nice work. I test fit my rears with 12mm spacers and with that I thought that a 9.5" ET40 would be needed but surprised that 9.5" ET32 is.

Thanks, Jimminez. I did test fit this combo without spacer. Just too close for comfort.

V cool to see W212 owners pushing boundaries and fitting wide tires on these heavy pigs.

That said I think 265/35R19 would be a better fit esthetically and it is also a good O.D. match for a 295/30R19 rear. With the 275 front I would want the height of a 305/30R19 out back and that would be a difficult size to fit. What size are you running on the rear?

FWIW I tried the stock 19x9" et37 + 10mm spacer (effective et 27) and it rubbed at full compression on my 4Matic E63.

Yeah, once I bolted the wheel with the tire onto the car I felt it was a bit too much meat. A couple of days later, I felt I couldn't have made a better choice. It's hard to capture in pictures what you see in person. For example, the wheels don't look very concave in these pics... when in person, they very much are. I love how muscular the car looks at certain angles with this set up.... obviously, some people would hate it... to each their own.

Rear rubber


This is how close it sits to strut... Plenty of room... seemingly...


However, this is how close the rear sits to the body/ liner


With the stock wheel + 10mm spacer you must have rubbed on the fender, right? With my current set up the rim protection lip on the tire does sit a mm or two past the fender. So far I have driven over speed bumps at 5-10 mph and driven outta my driveway at full lock and all seems fine (knock on wood).

My thought was to run either 285/30 or 265/35 square on some TE37s. Feel like the meat that the 285 on a 9.5 is better than the 265.

Definitely looking forward to seeing more pics @Rehabguy

How would running a square set up work on 4matic? I did the square set up thing for too long on my old Subby, staggered all the way now for me! lol! I'd be interested in seeing what 285/30 would look like on a 9.5" wheel. BTW, I know you had Kmac camber paltes installed on your fantastic-wagen and I know that they move the whole strut inward and outwards without changing how the wheel/tire sits in relation to the strut. I have read that there is only minimal camber adjustment via stock hardware (or was that TOE adjustment?)... would you happen to know if stock adjustments of camber work the same as with camber plates (only with less range of motion?) I ask b/c I might be interested in dialing in a bit more negative camber up front and I dunno if I wanna go the camber plate route (due to cost, of course).