Originally Posted by threeMBs

I read what the OP wrote.

I also read what you wrote:

"
I run 295/35/19 which are wider/taller with no problems....
I have 295/35/19 on the rears and 265/30/19 on the front with no problems...

The 5mm (30 vs 35) in height is less then the tire wear from new to worn out... The 5mm is in reality only 2.5mm from the center of the spindle to the ground... Tire manufacturers have more then 5mm difference even in the same companies different tires. Longer tread life tires will be taller (deeper tread) when new then ultra hi-po tires of the exact same size.
"

1. OP question vs. your answer:
285/30-19 vs. 285/35-19 is not 5mm - its 25.4mm (1").
FYI: 285/30 vs. 295/30 is 8mm and 285/35 vs. 295/35 is 8mm too.
Width is not in question here - hight is.

2. Tires sizes that you stated you're runnnig:
265/30-19 is a full inch less in diameter that stock's 26"
295/35-19 is full inch more in diameter than stock's 26"
difference is full 2" front to rear.

From what you wrote, it means you have no idea what you're talking about or made a costly typing error.

For people who do not know how to calculate tire dimeter and then convert from mm into inchs, this is the formula:

width of tire in mm (first number) * aspect ration (second number) / 2540 (to convert to inches) = sidewall hight, since there are 2 sidewalls (hope everyone understands this) need to multiply by 2 then add wheels diameter.

In your example, that you say you're running on SL:

front (265 * 30 / 2540 *2 ) + 19 = 25.23" (much less than stock's 26")
rear (295 * 35 / 2540 *2) + 19 = 27.13" (much more than stock's 26")

Now what I think you meant to write, was that you're running:

front: 265/35-19 instead of 255/35-19 (that is 10mm wider and 1/5" higher than stock, but is absolutely fine)
rear: 295/30-19 instead od 285/30-19 (that is also 10mm wider and only 1/9" higher than stock, but is absolutely fine too).

I'm 100% sure that's what you're running, not what your wrote.

When people ask question, especially for tire sizes, puting a wrong aspect ration by mistake can lead to them making a wrong and $$$ costly decision. That's my only point.

To the original poster:

On the SL as on most if not all MBs, you must keep front and rear tires diameters the same or as close as possible, that is why I wrote that if you want to use 285/35-19 (a full inch higher tire that stock's 285/30-19) at the rear, you must also increase front's diameter by close to 1" too, hence 245/40-19 (fyi: 255/40-19 will rub).