Honda Sportrax TRX250X 2019 Owner's Manual page 143

Also, if you hit a pothole or other hard object while riding, stop as
soon as you safely can and carefully inspect the tires for damage.
Tread Wear
Front
(3)
Rear
(1) groove depth
(2) wear indicator
To check the condition of a tire tread, measure the groove depth (1)
in the center of the tire, or check the wear indicator (2).
For best performance, you should replace a tire before the tread
depth at the center reaches the following limits:
front
rear
(1)
3/16 in (4
mm)
(2)
3/16 in (4
mm)
(1)
(3) wear indicator
location mark
3/16 in (4 mm)
3/16 in (4 mm)
Servicing Your Honda
Tires
NEW
Replace
NEW
Replace
133