S63AMG888

iTrader: (3)

As the title states, I am thinking about installing larger tires ( PS4s 275/35/20 and 305/30/20 ) on OEM wheels? Pros and cons? Photos would be great if you have this setup. Thank you.

kponti

I have 275/35/20s but stock rears. I also have spacers front and rear

RevisionCuda

Wouldnt that mess with the transfer case?

S63AMG888

iTrader: (3)

That is one of the main reason I going a size bigger was to avoid spacers. If your running 275 up front, what size spacers was used on the front?

Got any photos with the 275 on?

Thank you.

kponti

I used 15mm upfront and 10mm in the rear Pretty flush front and back

kponti

I doubt that minor of a change will cause any damage. Even changing to winter wheels and tires will result in a larger change (between front and rear) than this

265/35/20 vs 275/35/20 has an overall diameter change of 3.5mm between them (1.75mm radius change)

PeterUbers

tired pressure variances alone accounts for this

S63AMG888

iTrader: (3)

Do you think there would be any problems running 275/35/20 front and 305/30/20 on stock OEM wheels ( 20x9.5 front and 20x10.5 rear ) and would the car being lowered jeopardize this setup? Many thanks for your help.

kponti

I do not believe there will be any issues. However, I could not run that because of my 10mm spacer in the rear. I am at the limits of what looks good and does not stick out with the stock wheel/tire and a 10mm spacer in the rear.
If I do go with larger tires in the rear in the future, I will get rid of my spacers.
Now in the front, you can go wider than 275/35/20 with no issues. I have that plus a 15mm spacer and its still clears no problem. I could go 20mm spacer to be honest.

On an unrelated note: I have detected a stability issue with my 275/35/20 plus 15mm spacer. I ordered 10mm spacers and waiting to see whether it helps.
The stability problems only happen under WOT as the speed builds. The car is fine as long as you are going very very straight. If you turn a slight bit over 40-50mph under WOT, it wants to swing like crazy to one side of the other. Seems very unstable and squirly. I am thinking it might be airflow issues since a larger chuck of tire is exposed to the wind forming around the front bumper with those spacers. It only got this way after I went with larger tires.

S63AMG888

iTrader: (3)

Thank you, just had the 305/30/20 installed on the rear and waiting for the 275/35/30 PS4s to come in. The new rear PS4s looks pretty flush for my taste and don’t plan on installing spacers and hopefully I don’t run into any stability issues?!

Maybe removing your spacers for your front 275/35/20?

BTW, what PSI are you running with your wheels?

Thank you.

kponti

You are right, I shod have done that. I drove around with stock wheel and tire combo with the spacers for 8 months without an issue so I didn't even think about that when I went with bigger tires.
305/30/20 with the 275/35/20 and no spacers would have been the best combo. Though I may have done 285/35/20 in the front.

Unfortunately the front tires wear out faster than the rear in this car so I'll just keep going smaller on the front spacers till I get it more stable .

I will attach some.pics of what it looks like with the 15F/10R spacers

kponti

S63AMG888

iTrader: (3)

Thats odd you say the front wear out faster than the rear, my rear passenger side was at 0mm and rear driver side was 2mm. Front tires is at 5mm. Os there a solution that you know of to help with toe and chamber?

L M

I understand that these wider tires may look better, but how much heavier are they and how much more sidewall flex is there during hard/spirited cornering?
These would be my concerns.

kponti

I guess I should have added, with a consistent spirited launching lol.
My Pirellis definitely was wearing out faster in the front than the rear, but my Michelins seem to wear about the same
I am not lowered so I cannot help there.
There was a very obnoxious dude on here who got a company to make new upper control arms to counter excessive camber on the front. If it lasted (ie didn't break like his first attempt), it will be a good option. But it only helps the front not the rear.

kponti

Definitey heavier, definitely squishier. Better for drag racing, not so sure about the track. On the street, bump up the tire presure

Which reminds me, someone asked about tire pressures. I typically run 40psi cold in the rear and 38psi cold in the front. Why more pressure in the rear? Less squat, car seems easier to control during transitions, and I found it to be more stable at much higher illegal speeds with that bias.

I used to be big on higher pressure in the fronts until I went wider in the front.

S63AMG888

iTrader: (3)

Both MY17 W222 S63 and W213 E63s wagon came with Pirellis Pzero and really don’t like them as they are softer compound than the PS4S and feel they wear out faster. If my guess is right about the obnoxious dude your talking about, he likes testing the limits in the canyons and did read through the long post about the disappointment about Kmac!?

S63AMG888

iTrader: (3)

I am running 46psi front and 43psi in the rear, but that is hot pressure and 99% of my drive are with 3 people in the car.

ska597

This looks great. How does the set up look from the back view? Do the rear tires look noticeably wider than the 295s? This is something I would love to do on my car too. This car should have wider tires from factory imo. Thanks for starting this tread!

S63AMG888

iTrader: (3)

Thank you and yes, they should of shipped from the factory like this. Here are some side and rear photos for reference, note it is lowered:

kponti

That would be him. He has the wagon

maxswede

how has tire wear been? Still digging the wider setup?