CITROEN DS3 Handbook page 210

Access to the spare wheel
The spare wheel is installed in the boot under
the floor.
According to country, you will have either a
"space saver" spare wheel or a temporary
puncture repair kit.
For access to it, refer to the paragraph "Access
to the tools" on the previous page.
Fitting the "space-saver"
type spare wheel
If your vehicle is fitted with alloy
wheels, it is normal to notice, when
tightening the bolts on fitting, that the
washers do not come into contact with
the "space-saver" type spare wheel.
The wheel is secured by the conical
contact of each bolt.
Taking out the wheel
F Unscrew the yellow central bolt.
F Raise the spare wheel towards you from
the rear.
F Take the wheel out of the boot.