Tire Tech – Tire 411
Tire Rotation – A change in position can make a big difference. Using tires for a long period of time in the same position will typically create more wear, especially on the front. For longer tire life, it’s necessary to perform tire position rotation periodically as recommended by the tire manufacturer. Tire rotation are usually recommended every 5,000 to 7,000 miles. Please note that tire rotation is not possible with certain applications such as staggered fitments. Advantages of tire rotation includes prevention of uneven tread wear, extension of service life and advantages of tire fatigue.
Tire Replacement – Triangular shaped marks on the sidewall show the tread grooves position of the “Tread Wear Indicator” (TWI). The TWI represents 1.6 mm of remaining tread depth, at which time the tire should be replaced. Arrow shaped marks on the sidewall show the tread groves position of the “Platform Wear Indicators.” This shows 50 percent of the wear of original tread depth, at which time it should no longer be used as a winter tire, but can be used as a normal tire.
Over Inflation Tire Pressures – To achieve maximum performance from your tires and the handling of your vehicle, it is important that you have the tires properly inflated. Over inflated tires have smaller “footprints” and produce less traction. In addition over inflated tires have abnormal tire wear, center wear of tread, jumpy ride discomfort and vehicle stability decrease.
Under Inflation Tire Pressures – To achieve maximum performance from your tires and the handling of your vehicle, it is important that you have the tires properly inflated. Under inflated tires have decreased durability and life. In addition under inflated tires create more tire deflection, weaken the tire internal structure and eventually lead to tire failure, 25% decrease tread life, separation and cord break, poor cornering, and hydroplaning.
Tire inflation Pressure Tips – Because air expands as the temperature rises, inflation pressure increases after running. It’s best to check pressure when the tire is cold. Special care is required for tire inspection of front wheel vehicles because the front wheels bear a heavier load. If a hot tire shows less than the recommended cold inflation pressure, then the tire is under inflated. Inflate it to the recommended cold inflation pressure plus an additional 10%. As soon as the tire cools down, recheck and set the pressure to the recommended level.
Tire Construction 411 – Understanding the essential components of a tire such as the structure, location and purpose of each component on a tire.
Shoulder – The shoulder on each side of the tread is designed to protect the belt and carcass by dissipating heat. Sidewall – The sidewall on each side of the tire is the section that deflects during use. It is also the area where all of the notations such as tire size, brand, name manufacturer, etc are located. Bead – The bead area supports the carcass and is where the tire anchors to the custom rim. Tread – The tread is the part of a tire that make contact with the road surface. Belt – The belt is located below the tread and improves the stiffness of the tread area. Carcass – The carcass forms the body of the tire and is the load bearing, supports the load and absorbs impact. Inner Liner – The inner liner is a layer of special rubber attached to the carcass that has high resistance to air migration.
Tire Tech – Tire 411
Tire Diameter – To calculate the overall tire diameter you only need the size of the original tire. If you want your new tires and custom rims to fit, keep this size the same. You may increase the custom rim size only if you decrease the tire side wall size. Otherwise some modifications may be need to the fender opening. You must also consider the width of the rim and tires, otherwise additional modifications may be needed. Oversized fitments should be left to professionals.
2009 Dodge Challenger – Tire Tech – Tire 411