285/30/19s on sedan c63s
I think 285/35 on the rear is the best compromise.
Still can't decide between 255 or 265 up-front though.
255 would only be an increase of 10mm (while the rear increased by 20mm). It could lead to more understeer for the car.
265 would match the 20mm increase in the rear, but may be too wide for the front wheel and bulge too much.
If you already got Michelin PSS, going 265 up front allows you to put the rear tire on the front wheel and then all you have to do is buy a new rear tire.
I got Continental ExtremeContact Sport, so I'd be swapping all 4 to Michelin PS4 anyway.

Can you please share some pictures of the 265/35 on the front wheel?
Thanks!
Do you have a picture of the front tires? You have 255/35-19 for the front right?
The Best of Mercedes & AMG
Will 255 35 r19 and 285 30 r19 work on mercedes c43 amg ? front and rears stock suspension ?

Ill be running 255/35/19 front and 285/30/19 rear on stock c63 19" forged sedan wheels






