TOYOTA 2011 Sienna - Manual (Page 684)

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4-3. Do-it-yourself maintenance
Tires
Replace or rotate tires in accordance with maintenance sched-
ules and treadwear.
■ Checking tires
New tread
Treadwear indicator
Worn tread
The location of treadwear
indicators is shown by the
“TWI” or “
” marks, etc.,
molded on the sidewall of
each tire.
Vehicles with compact spare
tire: check spare tire condi-
tion and pressure if not
rotated.