Vehicle Care 9-69GM's exclusive TPC Specsystem considers over a dozencritical specifications that impactthe overall performance of yourvehicle, including brake systemperformance, ride and handling,traction control, and tirepressure monitoringperformance. GM's TPC Specnumber is molded onto the tire'ssidewall near the tire size. If thetires have an all‐season treaddesign, the TPC Spec numberwill be followed by an MS formud and snow. See TireSidewall Labeling on page 9‑53for additional information.GM recommends replacing tiresin sets of four. This is becauseuniform tread depth on all tireswill help keep your vehicleperforming most like it did whenthe tires were new. Replacingless than a full set of tires canaffect the braking and handlingperformance of your vehicle.See Tire Inspection on page 9‑66and Tire Rotation on page 9‑66for information on proper tirerotation.{ WARNINGMixing tires could cause youto lose control while driving.If you mix tires of differentsizes, brands, or types (radialand bias-belted tires), thevehicle may not handleproperly, and you could havea crash. Using tires of differentsizes, brands, or types mayalso cause damage to yourvehicle. Be sure to use thecorrect size, brand, and typeof tires on all wheels. It is allright to drive with yourcompact spare temporarily, asit was developed for use onyour vehicle. See CompactSpare Tire on page 9‑100 .{ WARNINGIf you use bias-ply tires on thevehicle, the wheel rim flangescould develop cracks aftermany miles of driving. A tireand/or wheel could failsuddenly, causing a crash.Use only radial-ply tires withthe wheels on the vehicle.If you must replace yourvehicle's tires with those that donot have a TPC Spec number,make sure they are the samesize, load range, speed rating,and construction type (radial andbias‐belted tires) as yourvehicle's original tires.