Polaris Trail Boss 330 Quadricycle - Manual (Page 84)

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MAINTENANCE AND LUBRICATION
Tires
Tire Tread Depth
Always replace tires when tread
depth is worn to 3 mm or less.
WARNING
Operating your vehicle with worn tires,
improperly inflated tires, non-standard
tires or improperly installed tires will
affect vehicle handling and could cause
an accident.
Maintain proper tire pressure as described on the decal on your
vehicle and in the specifications section of the owner’s manual
beginning on page 108.
Use only original equipment size and type when replacing tires.
Make sure the wheels are installed properly.
Replace tires when the tread depth measures 3 mm or less.
Wheel and Hub Tightening
Wheel hub and bearing tightness and spindle nut retention are critical
items. These services must be performed by an authorized dealer.