2009-2011 Honda FourTrax Rancher AT TRX420FA/FPA Service Manual, Page 85Get this manual
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MAINTENANCE
Tire size Tire brand Minimum tread depth (FrontRear) Toe
Standard With cargo Front Rear Front Rear
SPECIFICATIONSmm (18-13 in) BKR5E-11 (NGK), K16PR-U11 (DE