Honda CBR600RR 2009 Owner's Manual page 155

Tires
For the best performance, you should
replace a tire before the tread depth at the
center reaches the following limits:
front
rear
If the wear indicators are visible, replace
the tire immediately as it is no longer safe.
146
Servicing Your Honda
0.06 in (1.5 mm)
0.08 in (2.0 mm)
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.