The standard tire size for the S500 is 235/60R16. I have these on my car and the 'ride' is beautiful. Both front an back.

If you change to 18" wheels, you should use 255/45ZR18 tires to keep the speedometer 'close' to calibration.

__________________
Regards . . . . JimF
-------------------
'94 S500 Cpe

Visit my Mercedes Web Page