Mazda CX-3 2018 Owner's Manual page 488

If Trouble Arises
Flat Tire
10. Thread the belt through the rear seat as
shown in the figure.
11. Place the flat tire in the luggage
compartment.
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CX-3_8GA5-EA-17F_Edition1
12. Thread the buckle through the wheel as
shown in the figure.
13. Thread the belt through the buckle
while pressing the tire to the seatback.
14. Pull the belt end to secure the flat tire.
2017-4-7 15:30:54