Honda 2006 RC51 Owner's Manual page 143

Tires
You should replace the tires with tires of
the same size, load range, and speed rating
as the originals.
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.
136
Servicing Your Honda
The recommended tires for your
motorcycle are:
Whenever you replace a tire, remember:
Classic Cycles Technical Resources
120/70ZR17M/C (58W)
front
DUNLOP D208FN
METZELER MEZ3H
FRONT RACING
190/50ZR17M/C (73W)
rear
DUNLOP D208N
METZELER MEZ3H
RACING
radial-ply, tubeless
type
Have the wheel balanced after the tire is
installed.
Have the tire replaced by your Honda
dealer if possible.