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– Grooves across the tire have different depths, which may be an indication of an improperly inflated tire or some other underlying tire or vehicle issue.

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Tires with not enough air pressure. Air should be added to the tires to the vehicle’s recommended psi.

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A mark molded into the base of the main grooves of the tire which shows if the tread surface is worn. When the tread surface is worn to the same level as these indicators, the tire is beyond the minimum safe limit and should be replaced.

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The overall condition of the remaining tread – is it evenly worn, is there sufficient tread depth remaining?

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Each tire and wheel is removed from your vehicle and moved to a different position to ensure that all tires wear evenly and last longer and should be done every 6,000 to 8,000 miles.

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– An instrument or tool used to check the amount of air pressure in your tire(s).

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The person who sells, installs and/or repairs tires and is trained in selling, installing, inspecting and repairing tires.

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The amount of air in your tire(s) measured in psi (pounds per square inch). Incorrect tire pressure can affect a vehicle’s handling and braking.

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The distribution of weight within a tire to which it is attached. If the wheel is out of balance one area is heavier or lighter than the rest. Have your tires balanced when a tire is replaced, when a balance weight is moved or removed and when you purchase new tires.

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– Slight adjustment of front and/or rear suspension components by a tire professional so your vehicle and tires drive straight and do not pull to one side. This should be done if you hit a sizeable object on the road, you see a wear pattern on the outer edges of the tire, you notice a difference in the vehicle’s handling or at least every 4,350 miles.

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Extra tire in the trunk of your vehicle if your tire is flat or damaged and needs to be replaced temporarily until it can be checked by a tire professional.

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– The measurement for tire pressure. The recommended psi for your vehicle can be found on the driver’s side door jamb of the vehicle or in the vehicle owner’s manual.

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Used to determine if your tires tread is good or if it is low and needs replaced by inserting a penny with Lincoln’s head face down into the lowest part of the tread. It is important to conduct the Penny Test in multiple places on the tire tread, because tires can wear unevenly. If Lincoln’s head is covered by the tread the tire is good in that spot, if the top of the head is not covered and can be seen the tread is low and the tire needs replaced.

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– Tires with too much air pressure. Air should be removed from the tire to the vehicle’s recommended psi.

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The legal minimum tread depth in the United States. If your car is at or below that your tires need replaced.