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Maintenance Fundamentals
265
Maintenance
The service life of your tires is dependent on
many factors, including, but not limited to, riding
habits, road conditions, vehicle loading, tire air
pressure, maintenance history, speed, and
environmental conditions (even when the tires
are not in use).
In addition to your regular inspections and
maintenance, it is recommended that you have
annual inspections performed once the tires
reach 5 years old. It is also recommended that all
tires be removed from service after 10 years
from the date of manufacture, regardless of their
condition or state of wear.
The last four digits of the TIN (tire identification
number) indicate the date of manufacture.
#
Tire Identification Number (TIN)
The tire identification number (TIN) is a group of
numbers and letters located on the sidewall of
the tire.
Tire Service Life
!a !b!c
DOT XXXX XXXX 22 09
DOT: This indicates that the tire meets all
requirements of the U.S.
Department of Transportation.
!a XXXX: Factory code
!b XXXX: Tire type code
!c 22 09:
Date of manufacture (week & year).
Example: week 22 in year 09.
Tire Labeling Example
Tire identification
number (TIN)
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