TOYOTA 2012 Yaris Hatchback - Manual (Page 297)

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5-2. Steps to take in an emergency
Installing the tire
Remove any dirt or foreign mat-
ter from the wheel contact sur-
face.
If foreign matter is on the wheel
contact surface, the wheel nuts
may loosen while the vehicle is
in motion, causing the tire to
come off.
Install the spare tire and loosely tighten each wheel nut by
hand by approximately the same amount.
When replacing a steel wheel
with a compact spare tire, tighten
the wheel nuts until the tapered
portion comes into loose contact
with the disc wheel sheet.
When replacing an aluminum
wheel with a compact spare tire,
tighten the wheel nuts until the
tapered portion comes into loose
contact with the disc wheel
sheet.
Disc wheel sheet
Tapered portion
Disc wheel sheet
Tapered portion