1999 GMC Sierra 1500 Pickup Owner's Manual - Page 356

Service & Appearance Cam Tire lnspecfion and Rotation To makeyour tireslastlonger,havetheminspectedandrotatedatthe mileagesrecommended in theMaintenanceSchedule.See"Scheduled MaintenanceServices" in theIndex. - Q K2655 - Usethisrotationpattern. If your vehicle has front tires with different load ratings or tread designs (such asallseason vs. onloffroad)thanthereartires,don'trotateyourtiresfront to rear. Afterthetireshavebeenrotated,adjustthefrontandrearinflationpressure as shownonthe CertificationRire label.Makecertainthatallwheel in the Index. properlytightened. See"WheelNutTorque" nuts are A Rust or dirtona wheel,or onthe parts to which -it i fastened,can s make the wheel nuts become loose after a time. The wh.eel could a-:wheel,remove come off and cause an accident. When you change' any -rust or dirtfromplaceswherethewheelattaches to the vehicle: In anemergency, youcanuse a cloth orpapertowel to do this; but 3 besure to useascraperorwirebrushlater, if youneed- to, to get - T all the rust or dirf off. See "ChangingaFlat Tire" in the Index. : , 6-78