Maintaining/storing the speed
Press the button.
or:

Press the rocker switch while the system is interrupted.
When the system is switched on, the current speed is maintained and stored as the desired speed.
It is displayed in the speedometer and briefly displayed in the instrument cluster, Displays in the instrument cluster.
When cruise control is maintained or stored, DSC Dynamic Stability Control is switched on, if necessary.
See also:
After the ignition is switched off
The roof can still be operated for approx. 1 minute,
as long as no door has been opened. ...
Tire identification marks
Tire size
255/50 R 19 103 Y
255: nominal width in mm
50: aspect ratio in %
R: radial tire code
19: rim diameter in inches
103: load rating, not for ZR tires
Y: speed rating, before the R on ZR ...
Notes
The vehicle equipment does not include a spare
tire.
When using run-flat tires* or tire sealants, a tire
does not need to be changed immediately in the
event of pressure loss due to a flat tire ...
