Honda VTX1800R Owner's Manual page 125

Tires
Also, if you hit a pothole or hard object
while riding, pull to the side of the road as
soon as you safely can and carefully
inspect the tires for damage.
Tread Wear
(1)
(1) wear indicator
(2) wear indicator location mark
116
Servicing Your Honda
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.
(2)
Tire Repair (Cast Wheels)
Refer to
We strongly recommend that you replace,
not repair, any tire that is punctured or
damaged. As discussed below, a tire that is
repaired, either temporarily or
permanently, will have lower speed and
performance limits than a new or
undamaged tire.
0.06 in (1.5 mm)
0.08 in (2.0 mm)
Saf ety Precautions on page 56 .