Honda CB250 Nighthawk Owner's Manual page 121

Tires
Have a new tube installed whenever a
tire is replaced. The old tube will
probably be stretched. If installed in a
new tire, it could fail.
If you have a tire professionally replaced
at a non-Honda facility, we recommend
that you have the work checked by your
Honda dealer.
Important Safety Reminders
Do not install a radial tire on this
motorcycle. Mixing bias-ply and radial
tires can adversely affect handling and
stability.
Do not install car tires on this
motorcycle. During installation the tire
may separate from the rim with enough
force to cause serious injury or death.
112
Servicing Your Honda