Honda CRF1100AL 2019 Owner's Manual page 252

Maintenance Fundamentals
#
Inspecting for Damage
Also inspect for any unusual bumps or bulges in
the side walls of the tyres.
#
Inspecting for Abnormal Wear
248
Inspect the tyres for
cuts, slits, or cracks that
exposes fabric or
cords, or nails or other
foreign objects
embedded in the side
of the tyre or the tread.
Inspect the tyres for
signs of abnormal wear
on the contact surface.
#
Inspecting Tread Depth
Inspect the tread wear indicators. If they
become visible, replace the tyres immediately.
For safe riding, you should replace the tyres
when the minimum tread depth is reached.
or TWI
Wear indicator
location mark