Honda TRX450ER Owner's Manual page 159

Tyres
Tyre Replacement
Refer to Saf ety Precautions
The tyres that came on your ATV were designed to match the
performance capabilities of your ATV and provide the best combination
of handling, braking, and comfort.
It is best to replace all four tyres, however if that is not possible, you
must replace the tyres in pairs (front or rear) with tyres of the same size
and type as the originals. Never replace just one tyre.
Installing improper tyres on your ATV 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 tyres
recommended in this owner's manual.
The recommended tyres for your ATV are:
front AT21
rear AT20
When you replace a tyre, remember:
Have the tyre replaced by your Honda dealer if possible.
If you have a tire professionally replaced at a non-Honda facility, we
recommend that you have the work checked by your Honda dealer.
150 Servicing Your Honda
on page 77 .
7R10 DUNLOP KT331H
10R9 DUNLOP KT355H