Honda 2009 GOLDWING GL1800 Owner's Manual page 198

Tires
Tire Service Life
The service life of your tires is dependent on many factors, including, but not
limited to, riding habits, road conditions, vehicle loading, tire pressure,
maintenance history, speed, and environmental conditions (even when the tires
are not in use).
In addition to your regular inspections and tire pressure 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) ( ) are found on the
sidewall of the tire, and indicate the date of manufacture.
Tire Identification Number (TIN)
The tire identification number (TIN) is a group of numbers and letters that look
like the following example.
TIN is located on the sidewall of the tire.
DOT
(2)
DOT This indicates that the tire meets all requirements of the U.S.
Department of Transportation.
(2)
(3)
(4) 22 07
TIRE LABELING EXAMPLE
(1) tire identification number (TIN)
192
Servicing Your Honda
22 07
(3) (4)
Factory code
Tire type code
Date of manufacture
Year
Week
1
(1)