294 VEHICLE CAREslight pull to the left or right,depending on the crown of the roadand/or other road surface variationssuch as troughs or ruts, is normal.If the vehicle is vibrating when drivingon a smooth road, the tyres andwheels may need to be rebalanced.See your dealer for proper diagnosis.Wheel ReplacementReplace any wheel that is bent,cracked, or badly rusted or corroded.If wheel nuts keep coming loose, thewheel, wheel bolts, and wheel nutsshould be replaced. If the wheel leaksair, replace it. Some aluminium wheelscan be repaired. See your dealer if anyof these conditions exist.Your dealer will know the kind ofwheel that is needed.Each new wheel should have the sameload-carrying capacity, diameter,width, offset, and be mounted thesame way as the one it replaces.Replace wheels, wheel bolts, wheelnuts, or Tyre Pressure Monitor System(TPMS) sensors with new GM originalequipment parts.{ WarningUsing the wrong replacementwheels, wheel bolts, or wheel nutscan be dangerous. It could affectthe braking and handling of thevehicle. Tyres can lose air, andcause loss of control, causing acrash. Always use the correct wheel,wheel bolts, and wheel nuts forreplacement.CautionThe wrong wheel can also causeproblems with bearing life, brakecooling, speedometer or odometercalibration, headlamp aim, bumperheight, vehicle ground clearance,and tyre or tyre chain clearance tothe body and chassis.Used Replacement Wheels{ WarningReplacing a wheel with a used oneis dangerous. How it has been usedor how far it has been driven maybe unknown. It could fail suddenlyand cause a crash. When replacingwheels, use a new GM originalequipment wheel.Tyre ChainsUse tyre chains or other tractiondevices only when necessary.Before using tyre chains, check withthe tyre manufacturer to make suretyre chains are compatible with thetyres on the vehicle. Follow themanufacturer's instructions.Tyre chains are only permitted onP245/40R18 93V size tyres. Installthem on the rear tyres only, as tightlyas possible with the ends securelyfastened.
