Just about every W210 E55 except the US come from the factory with 235/40/18 front and 265/35/18 OEM sizes. on 18X8 front and 18X9 rear rims.

Any speculation to why the US and Canada versions come with 245/40/18 and 275/35/18 tires?

The specs for the new W211 E55 in most other countries also list the 235 & 265 widths.

More rubber for bigger US *****.

 

That's acctually good&bad lol good is that 275 will stay better on the road, and bad that 275 on the back will cost more $$$ lol coz i think it will wear off really fast lol

 

I changed my tyres from 235/40 and 265/35 to 245 and 275 width respectively and immediately had rubbing problems. The guard had to be pulled out where the top of the front bumper/apron meets the wheelarch as the tyres rubbed at the front. I was a little surprised as this is as you have pointed out a standard fitment on US spec cars.

 

US spec cars probably have different offset wheels to account for the wider rubber.

Can't imagine why they upped the size but glad they did.