IdentificationAccessory and warranty replacement must use TPC spectires.An outboard orientation stripe is added to the tread surface,with an offset toward the outboard tire face.All GM approved tires (Production, Service and Accessory)have a TPC (Tire Performance Criteria) code.A replacement tire that lacks the original TPC code will notmeet the performance characteristics of the original tire, even ifit is the same brand, model and size.Force and MomentResidual Aligning Torque (RAT)Rolling ResistanceBraking TractionDriving TractionUniformityNoiseDimensionsMassRev/KMHigh SpeedAir RetentionElectrical ResistanceAutomatic MountingEndurance (ATE)TreadwearChip/tearGroove WanderRide and HandlingWet/Snow Handling
The TPC system facilitates tire replacement for GM customerson GM vehicle, meeting the same critical performance specificationsof GM vehicle original equipment tires.
Scrub Radius Description Wheels
Special Tools WheelsCylinder Boring and Honing (LAF, LEA, or LUK)
Boring ProcedureMeasure all pistons with a micrometer to determine thecylinder bore diameter. Refer toEngine Block Cleaning and Inspection.Before you use any type of boring bar, use a fine file andclean the top of the cylinder block, removing any dirt or burrs. Ifyou do not check the cylinder block, ...