gqdabien

Hello I have a 2009 SL63 and I'm thinking of going this size wheel:
Fronts: 20x9 +25
Rears: 20x11 +30
Stock fronts 19x8.5 +30, 255/35r19 (26" diameter)
Stock rears: 19x9.5 +30, 285/30r19 (25.7" diameter)

The recommended tire size by other r230 threads and forums is this:
255/30r20 (26")
305/25r20 (26")

However, I wanted to know if anyone is running this size tire (slight stretch, and it is about 4% larger in diameter).
245/35r20 (26.8" diameter)
295/30r20 (27" diameter)

I'm aware the speedo will be off slightly but i'd rather have more sidewall since my area has lots of potholes. I'm just not sure if the tire would rub against any body panels or suspension parts if i run this size.

Thanks!

pmercury

iTrader: (2)

you can set the speedo to the tire size with Xentry DAS

gqdabien

Thanks, but I am mainly concerned with the fitment of the tire inside the wheel gap etc.. any ideas there? Thanks!

Sl600kd

note to be aware of if the abc fails (hose burst) the car slowly sag on all wheels, stock wheels barely clear, but upping the size, that can be a potential issue, but thats a rare occurrence, and instead of limp home just tow.

Sl600kd

but yeah im thinking going with some 335/35r/19 or 20 (probably will need widebody tho) right now i have some 295/35r18 on the rear and rides better the stock size tires (more side wall) and theres still quite a gape between fender

gqdabien

So my ABC pump is already developing a slow leak from what my mechanic told me. I have AAA so if something disastrous happens i'll be towing home.

I just put in an order for 20x9 and 20x10.5 rims, i'm going to go with 245/35/20 and 285/30/20 for tires, hoping this fits no problems. I'm lowered about 1 inch all around using links.

BlownV8

Yeah, you would need a widebody. I'm running 18x13's with 335/30/18's.

SLcharge

I have had 20" fitted, but are back to 19", for the same reason you want more tire walls.

Where did you get these offset for your new rims ? They are somewhat off.
I run 19x9.5 ET30 in the front, with 265/35/19, and 19x11 ET25 in the rear, with 295/30/19. In the front, you will need the ET30, that the tire clears the inner fender when the steering wheel is fully turned.
I have it lowered 1" front and back, and the tires do clear the fenders just.
Due to the geometry of the suspension, the camber becomes more negativ with lower ride height, so that the tires go inwards into the fenders at the top. The same is true when the suspension is moving. A tip is always to leave the car with the front wheels straight, so that if the suspension fails, the tires will not damage the front fenders. In the rear, they just touch the inside of the fender and stay there,. No damage done.

Be aware that if you exceed 5% diff between front and rear, the ABS / ESP will set error. You can though change tire circumfence with DAS/Xentry, so that ABS/ESP will accept any tire diff.

My below picture is not updated, so these are the OEM AMG wheels.

gqdabien

So for my fronts I am getting only 9" wide with +25 offset. So I should be getting 1mm more clearance than your setup. The tires I plan on getting should put me within 1.1% diameter diff between front and rear so hopefully I dont get any warnings.

SLcharge

Your calculation are right.