Honda VTX1800R Owner's Manual page 128

Tire Replacement
Refer to Saf ety Precautions
The tires that came on your motorcycle
were designed to match the performance
capabilities of your motorcycle and
provide the best combination of handling,
braking, durability, and comfort.
You should replace the tires with tires of
the same size, load range, and speed rating
as the originals.
on page 56 .
Installing improper tires on your
motorcycle can affect handling
and stability. This can cause a
crash in which you can be
seriously hurt or killed.
Always use the size and type of
tires recommended in this owner's
manual.
Servicing Your Honda
Tires
119