Honda Rebel 2017 Owner's Manual page 56

Maintenance Fundamentals
#
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.
Wear indicator
location mark
52
WARNING
3
Riding on tyres that are excessively
worn or improperly inflated can cause a
crash in which you can be seriously hurt
or killed.
Follow all instructions in this owner's
manual regarding tyre inflation and
maintenance.
Germany
German law prohibits use of tyres whose tread
depth is less than 1.6 mm.