These Tire Quality Grades aredetermined by standards that the UnitedStates Department of Transportation hasset.
Tire Quality Grades apply to newpneumatic passenger car tires. They donot apply to deep tread, winter-typesnow tires, space-saver or temporaryuse spare tires, light truck or LT typetires, tires with nominal rim diameters of10 to 12 inches or limited production tiresas defined in Title 49 Code of FederalRegulations Part 575.104 ©)(2).
U.S. Department of Transportation Tirequality grades: The U.S. Department ofTransportation requires Lincoln MotorCompany to give you the followinginformation about tire grades exactly as
the government has written it.
Treadwear
The treadwear grade is a comparativerating based on the wear rate of the tirewhen tested under controlled conditionson a specified government test course.For example, a tire graded 150 wouldwear one and one-half (1 ½) times as wellon the government course as a tiregraded 100. The relative performanceof tires depends upon the actualconditions of their use, however, andmay depart significantly from the normdue to variations in driving habits,service practices, and differences inroad characteristics and climate.
Traction AA A B C
WARNING: The traction gradeassigned to this tire is based onstraight-ahead braking traction tests, anddoes not include acceleration, cornering,hydroplaning or peak tractioncharacteristics.
The traction grades, from highest tolowest are AA, A, B, and C. The gradesrepresent the tire’s ability to stop on wetpavement as measured under controlledconditions on specified government testsurfaces of asphalt and concrete. A tiremarked C may have poor tractionperformance.
Temperature A B C
WARNING: The temperature gradefor this tire is established for a tire thatis properly inflated and not overloaded.Excessive speed, underinflation, orexcessive loading, either separately orin combination, can cause heat buildupand possible tire failure.
The temperature grades are A, thehighest, B and C, representing the tire’sresistance to the generation of heat andits ability to dissipate heat when testedunder controlled conditions on aspecified indoor laboratory test wheel.Sustained high temperature can causethe material of the tire to degenerate
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and reduce tire life, and excessivetemperature can lead to sudden tirefailure. The grade C corresponds to alevel of performance which allpassenger car tires must meet under theFederal Motor Vehicle Safety StandardNo. 139. Grades B and A representhigher levels of performance on thelaboratory test wheel than the minimumrequired by law.
Glossary of Tire Terminology
•Tire label: A label showing theoriginal equipment tire sizes,recommended inflation pressure andthe maximum weight the vehicle cancarry.
•Tire Identification Number: Anumber on the sidewall of each tireproviding information about the tirebrand and manufacturing plant, tiresize and date of manufacture. Alsoreferred to as DOT code.
•Inflation pressure: A measure of theamount of air in a tire.
•Standard load: A class of P-metric orMetric tires designed to carry amaximum load at set pressure. Forexample: For P-metric tires 35 psi(2.4 bar) and for Metric tires 36 psi(2.5 bar). Increasing the inflationpressure beyond this pressure willnot increase the tire’s load carryingcapability.
•Extra load: A class of P-metric orMetric tires designed to carry aheavier maximum load at 41 psi(2.8 bar) and 42 psi (2.9 bar).Increasing the inflation pressurebeyond this pressure will notincrease the tire’s load carryingcapability.
•kPa: Kilopascal, a metric unit of airpressure.
•PSI: Pounds per square inch, astandard unit of air pressure.
•Cold inflation pressure: The tirepressure when the vehicle has beenstationary and out of direct sunlightfor an hour or more and prior to thevehicle being driven for 1.0 mi(1.6 km).
•Recommended inflation pressure:The cold inflation pressure found onthe Safety Compliance CertificationLabel, affixed to either the door hingepillar, door-latch post, or the dooredge that meets the door-latch post,next to the driver's seating position,or Tire Label located on the B-Pillaror the edge of the driver’s door.
•B-pillar: The structural member atthe side of the vehicle behind thefront door
•Bead area of the tire: Area of the tirenext to the rim.
•Sidewall of the tire: Area betweenthe bead area and the tread.
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F. 95: Indicates the tire's load index. Itis an index that relates to how muchweight a tire can carry. You may find thisinformation in your owner’s manual. Ifnot, contact a local tire dealer.
Note:You may not find this informationon all tires because it is not required byfederal law.
G. H: Indicates the tire's speed rating.The speed rating denotes the speed atwhich a tire is designed to be driven forextended periods of time under astandard condition of load and inflationpressure. The tires on your vehicle mayoperate at different conditions for loadand inflation pressure. These speedratings may need to be adjusted for thedifference in conditions. The ratings
range from 81–186 mph (130–299 km/h).These ratings are listed in the followingchart.
Note:You may not find this informationon all tires because it is not required byfederal law.
Speed ratingLetter rating
81 mph (130 km/h)M
87 mph (140 km/h)N
99 mph (159 km/h)Q
106 mph (171 km/h)R
112 mph (180 km/h)S
118 mph (190 km/h)T
124 mph (200 km/h)U
130 mph (210 km/h)H
149 mph (240 km/h)V
Speed ratingLetter rating
168 mph (270 km/h)W
186 mph (299 km/h)Y
Note:For tires with a maximum speed
capability over 149 mph (240 km/h), tire
manufacturers sometimes use the letters
ZR. For those with a maximum speed
capability over 186 mph (299 km/h), tire
manufacturers always use the letters
ZR.
H. U.S. DOT Tire Identification Number:This begins with the letters DOT andindicates that the tire meets all federalstandards. The next two numbers orletters are the plant code designatingwhere it was manufactured, the next two
are the tire size code and the last fournumbers represent the week and yearthe tire was built. For example, thenumbers 317 mean the 31st week of1997. After 2000 the numbers go to four
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M. Maximum Permissible InflationPressure: Indicates the tiremanufacturers' maximum permissiblepressure or the pressure at which themaximum load can be carried by the tire.This pressure is normally higher than thevehicle manufacturer's recommendedcold inflation pressure which can befound on the Safety ComplianceCertification Label, affixed to either thedoor hinge pillar, door-latch post, or thedoor edge that meets the door-latchpost, next to the driver's seatingposition, or Tire Label which is locatedon the B-Pillar or the edge of the driver’sdoor. The cold inflation pressure shouldnever be set lower than therecommended pressure on the vehiclelabel.
The tire suppliers may have additionalmarkings, notes or warnings such asstandard load, radial tubeless, etc.
Additional Information Contained onthe Tire Sidewall for LT Type Tires
Note:Tire Quality Grades do not applyto this type of tire.
LT type tires have some additionalinformation beyond those of P type tires;these differences are described below.
A. LT: Indicates a tire, designated by theTire and Rim Association, that isintended for service on light trucks.
B. Load Range and Load InflationLimits: Indicates the tire's load-carryingcapabilities and its inflation limits.
C. Maximum Load Dual lb (kg) at psi(kPa) cold: Indicates the maximum loadand tire pressure when the tire is usedas a dual; defined as four tires on therear axle, a total of six or more tires onthe vehicle.
D. Maximum Load Single lb (kg) at psi(kPa) cold: Indicates the maximum loadand tire pressure when the tire is usedas a single; defined as two tires, total onthe rear axle.
Information on T Type Tires
T145/80D16 is an example of a tire size.
Note:The temporary tire size for yourvehicle may be different from thisexample. Tire Quality Grades do notapply to this type of tire.
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T type tires have some additionalinformation beyond those of P type tires;these differences are described below:
A. T: Indicates a type of tire, designatedby the Tire and Rim Association, that isintended for temporary service on cars,sport utility vehicles, minivans and lighttrucks.
B. 145: Indicates the nominal width ofthe tire in millimeters from sidewall edgeto sidewall edge. In general, the largerthe number, the wider the tire.
C. 80: Indicates the aspect ratio whichgives the tire's ratio of height to width.Numbers of 70 or lower indicate a shortsidewall.
D. D: Indicates a diagonal type tire.
R: Indicates a radial type tire.
E. 16: Indicates the wheel or rimdiameter in inches. If you change your
wheel size, you will have to purchasenew tires to match the new wheeldiameter.
Location of the Tire Label
You will find a Tire Label containing tireinflation pressure by tire size and otherimportant information located on theB-Pillar or the edge of the driver’s door.
Inflating Your Tires
Safe operation of your vehicle requiresthat your tires are properly inflated.Remember that a tire can lose up to halfof its air pressure without appearing flat.
Every day before you drive, check yourtires. If one looks lower than the others,use a tire gauge to check pressure of alltires and adjust if required.
At least once a month and before longtrips, inspect each tire and check the tire
pressure with a tire gauge, includingspare, if equipped. Inflate all tires to theinflation pressure recommended byLincoln Motor Company.
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You are strongly urged to buy a reliabletire pressure gauge, as automaticservice station gauges may beinaccurate. Lincoln recommends the useof a digital or dial-type tire pressuregauge rather than a stick-type tirepressure gauge.
Use the recommended cold inflationpressure for optimum tire performanceand wear. Under-inflation orover-inflation may cause uneventreadwear patterns.
WARNING: Under-inflation is themost common cause of tire failures andmay result in severe tire cracking, treadseparation or blowout, with unexpectedloss of vehicle control and increased riskof injury. Under-inflation increasessidewall flexing and rolling resistance,resulting in heat buildup and internaldamage to the tire. It also may result inunnecessary tire stress, irregular wear,loss of vehicle control and accidents. A
tire can lose up to half of its air pressureand not appear to be flat!
Always inflate your tires to the Lincolnrecommended inflation pressure evenif it is less than the maximum inflationpressure information found on the tire.The Lincoln recommended tire inflationpressure is found on the SafetyCompliance Certification Label, affixedto either the door hinge pillar, door-latchpost, or the door edge that meets thedoor-latch post, next to the driver'sseating position, or Tire Label which islocated on the B-Pillar or the edge of thedriver’s door. Failure to follow the tirepressure recommendations can causeuneven treadwear patterns andadversely affect the way your vehiclehandles.
Maximum Permissible InflationPressure is the tire manufacturer's
maximum permissible pressure and thepressure at which the maximum loadcan be carried by the tire. This pressureis normally higher than themanufacturer’s recommended coldinflation pressure which can be foundon the Safety Compliance CertificationLabel, affixed to either the door hinge
pillar, door-latch post, or the door edgethat meets the door-latch post, next tothe driver's seating position, or TireLabel which is located on the B-Pillar orthe edge of the driver’s door. The coldinflation pressure should never be setlower than the recommended pressureon the Safety Compliance CertificationLabel or Tire Label.
When weather temperature changesoccur, tire inflation pressures alsochange. A 10°F (6°C) temperature dropcan cause a corresponding drop of 1 psi(7 kPa) in inflation pressure. Check yourtire pressures frequently and adjustthem to the proper pressure which canbe found on the Safety ComplianceCertification Label or Tire Label.
To check the pressure in your tires:
1. Make sure the tires are cool,meaning they are not hot fromdriving even a mile.
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Note:If you are checking tire pressurewhen the tire is hot, for example drivenmore than 1.0 mi (1.6 km), never bleedor reduce air pressure. The tires are hotfrom driving and it is normal forpressures to increase aboverecommended cold pressures. A hot tireat or below recommended cold inflationpressure could be significantlyunder-inflated.
Note:If you have to drive a distance toget air for your tires, check and recordthe tire pressure first and add theappropriate air pressure when you getto the pump. It is normal for tires to heatup and the air pressure inside to go upas you drive.
2.Remove the cap from the valve on
one tire, then firmly press the tiregauge onto the valve and measurethe pressure.
3. Add enough air to reach therecommended air pressure.
Note:If you overfill the tire, release airby pressing on the metal stem in thecenter of the valve. Then recheck thepressure with your tire gauge.
4. Replace the valve cap.
5.Repeat this procedure for each tire,including the spare.
Note:Some spare tires operate at ahigher inflation pressure than the othertires. For T type mini-spare tires, referto the Dissimilar spare wheel and tireassembly information for a description:Store and maintain at 60 psi (4.15 bar).For full-size and dissimilar spare tires,refer to the Dissimilar spare wheel andtire assembly information for adescription: Store and maintain at thehigher of the front and rear inflation
pressure as shown on the Tire Label.
6.Visually inspect the tires to makesure there are no nails or otherobjects embedded that could pokea hole in the tire and cause an airleak.
7. Check the sidewalls to make surethere are no gouges, cuts or bulges.
Inspecting Your Tires and Wheel ValveStems
Periodically inspect the tire treads foruneven or excessive wear and removeobjects such as stones, nails or glassthat may be wedged in the treadgrooves. Check the tire and valve stemsfor holes, cracks, or cuts that may permitair leakage and repair or replace the tireand replace the valve stem. Inspect thetire sidewalls for cracking, cuts, bruisesand other signs of damage or excessivewear. If internal damage to the tire issuspected, have the tire demounted andinspected in case it needs to be repairedor replaced. For your safety, tires that
are damaged or show signs of excessivewear should not be used because theyare more likely to blow out or fail.
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Improper or inadequate vehiclemaintenance can cause tires to wearabnormally. Inspect all your tires,including the spare, frequently, andreplace them if one or more of thefollowing conditions exist:
Tire Wear
When the tread is worn down to onesixteenth of an inch (2 mm), tires mustbe replaced to help prevent your vehiclefrom skidding and hydroplaning. Built-intreadwear indicators, or wear bars,which look like narrow strips of smoothrubber across the tread will appear onthe tire when the tread is worn down toone sixteenth of an inch (2 mm).
When the tire tread wears down to thesame height as these wear bars, the tireis worn out and must be replaced.
Damage
Periodically inspect the tire treads andsidewalls for damage, such as bulges inthe tread or sidewalls, cracks in thetread groove and separation in the tread
or sidewall. If damage is observed orsuspected have the tire inspected by atire professional. Tires can be damagedduring off-road use, so inspection afteroff-road use is also recommended.
Age
WARNING: Tires degrade overtime depending on many factors suchas weather, storage conditions, andconditions of use (load, speed, inflationpressure) the tires experiencethroughout their lives.In general, tires should be replaced aftersix years regardless of tread wear.However, heat caused by hot climatesor frequent high loading conditions canaccelerate the aging process and mayrequire tires to be replaced morefrequently.You should replace your spare tire whenyou replace the road tires or after sixyears due to aging even if it has notbeen used.
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