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Frequently Asked Questions
Tyre Terms - Advanced
Understand the more technical tyre terms spoken by the tyre dealer.
  • Tyres that deliver a measure of traction on snow and ice without sacrificing dry performance driving capabilities.

  • Tyres that provide a good balance of traction in rain or snow with good tread life and a comfortable, quiet ride.

  • Indicates the tyre's ability to provide a balance of traction in wet, dry, and winter conditions.

  • An advanced silica-based winter rubber compound that helps provide flexibility where the tread surface makes contact with the road.

  • A synthetic fabric used in some tyres that is (pound-for-pound) stronger than steel.

  • A key component of the tyre that is the contact point between the tyre and the wheel, designed to withstand forces the wheel puts on the tyre during mounting as well as the dynamic forces of driving and braking.

  • Responsible for transferring propulsion and braking torque from the wheel rim to the road surface contact area.

  • Two sidewall plies wrapped around each bead wire in opposite directions providing lateral stability but flex to absorb road irregularities.

  • A rubber-coated layer of cords that is located between the body plies and the tread. Cords are most commonly made from steel but may also be made from fiberglass, rayon, nylon, polyester or other fabrics.

  • A type of tyre with crossed layers of ply cord running diagonally to the center line of the tread.

  • The diameter of an imaginary circle drawn through the center of each lug nut hole and then measured from two holes that are directly across from each other. The measurement is used in selecting the proper wheel for replacement.

  • A technique practiced by drag racers and road testers to improve their off-the-line acceleration; applying the brake and throttle at the same time, increasing the engine rpm until release of the brake.

  • A term used to describe a loss of traction when negotiating a curve or when accelerating from a standing start. The tyres slide against, instead of grip, the road surface.

  • Synthetic rubber used to create today's tyres. It is virtually impenetrable to water and air.

  • A wheel's inward or outward tilt from vertical, measured in degrees. The camber angle is adjusted to keep the outside tyres flat on the ground during a turn.

  • Side or lateral force generated when a tyre rolls with camber, which can add to or subtract from the side force a tyre generates.

  • This is a reinforcing filler which, when incorporated into the tyre rubber compound, gives it a high resistance to wear.

  • The supporting structure of the tyre consisting of plies anchored to the bead on one side and running in a radius to the other side and anchoring to the bead. Also called casing.

  • Made up of thin textile fiber cables bonded into the rubber. These cables are largely responsible for determining the strength of the tyre.

  • At a given air pressure, how much weight each tyre is designed to carry. For each tyre size, there is a load inflation table to ensure the inflation pressure used is sufficient for the vehicle axle load.

  • The angle between a line drawn vertically through a wheel's centerline and the axis around which the wheel is steered; improves a car's directional stability and on-center feel.

  • An imaginary line down the center of the vehicle. Alignment tracking is measured from this line.

  • The sideways acceleration, measured in g's, of an object in curvilinear motion. As a car traverses a curve, centrifugal force acts on it and tries to pull it outward. To counteract this, the tyres develop an equal and opposite force acting against the road. Also called lateral force.

  • The strands of fabric forming the plies or layers of the tyre. Cords may be made from polyester, rayon, nylon, fiberglass or steel.

  • The force on a turning vehicle's tyres - the tyre's ability to grip and resist side force - that keeps the vehicle on the desired arc.

  • Provide the rigid base for the tread which allows for good fuel economy. The plies also provide centrifugal and lateral rigidity to the tyre, and are designed to flex sufficiently for a comfortable ride.

  • Weight of a production vehicle with fluid reservoirs (including fuel tank) full and all normal equipment in place, but without driver or passengers.

  • The ability of a vehicle to be driven safely and with confidence in a straight line and at high speed without being affected by pavement irregularities, crosswinds, aerodynamic lifting forces, or other external influences.

  • Track is the width between the outside tread edges of tyres on the same axle. Tracking, or more specifically "Dog Tracking", refers to a condition in which the vehicle is out of alignment, and the rear wheels do not follow in the path of the front wheels when the vehicle is traveling in a straight line. Also called tracking.

  • Drift refers to a vehicle deviating from a straight-line path when no steering input is given. Also called pull.

  • Mounting of a tyre wheel assembly in such a way that the center of rotation for the assembly is not aligned with the center of rotation for the vehicle's hub.

  • Individual, spiral-wrapped nylon or aramid/nylon reinforcing filaments can be precisely placed in specific portions or across the entyre tread area atop the steel belts banded at zero degrees. Not only does this help retain tyre shape, but it also enhances ride quality and steering precision.

  • Transfer of weight from the front axle to the rear axle (or vice versa) caused by acceleration or braking. Acceleration causes weight transfer from the front axle to the rear axle. Braking causes weight transfer from the rear axle to the front axle.

  • A handling term describing a car with its front and rear tyres sliding in a controlled manner. The driver uses both throttle and steering to keep the vehicle on a prescribed path.

  • The radius of the tyre/wheel assembly that is not deflected under load.

  • The maximum weight that can be distributed among the tyres on a given axle.

  • The weight of the vehicle and its contents (fluids, passengers, and cargo).

  • The maximum weight allowed for the vehicle and its contents. This value is established by the vehicle manufacturer and can be identified on the vehicle door placard.

  • A normal, safe occurrence in a tyre's sidewall where overlapping splices of fabric cords form indentations. This cannot occur on tread due to steel cable implantation.

  • The innermost layer of a tubeless tyre, compounded with virtually impermeable butyl rubber. Some air loss over time will occur. Check your pressures monthly to ensure safe reliable operation of your tyres.

  • When a vehicle travels through a curve, weight is transferred from the wheels on the inside of the curve to the wheels on the outside of the curve. This is a result of the centrifugal force, or lateral force acting on the vehicle.

  • The measurement in inches from the wheel axle centerline to the ground when the tyre is properly inflated for the load.

  • The height of the section of the tyre that is making contact with the road.

  • Defines a range of maximum loads that tyres can carry at a defined pressure.

  • Wheels are manufactured to fit either the hub or the lugs. Lug-centric is matching the lug holes of a custom wheel perfectly to the lug pattern of the vehicle.

  • Generally designed for luxury sedans, this breed of tyres blends performance handling with a comfortable, smooth ride.

  • Rust process that takes place in the steel belts when moisture, via damage, is allowed to get inside the tyre. This can result in the tyre becoming unserviceable before normal replacement time.

  • The linear distance traveled by a tyre in one revolution (its circumference). This can vary with load and inflation. Rolling circumference can be calculated as follows: 63,360 divided by revolutions per mile = rolling circumference in inches.

  • A combination of raw materials blended according to carefully developed procedures. The rubber compound is specially adapted to the performance required of each type of tyre.

  • The combination of steel cords covered with rubber that forms a strip or belt placed under the tread rubber and on top of the casing (carcass); ensures uniformity when the tyre is rotating and helps prevent flats.

  • A vehicle's reaction to a driver's steering inputs. Also the feedback that drivers get through the steering wheel as they make steering inputs.

  • Man-made, as opposed to natural, rubber. Most of today's passenger car and light truck tyres have a relatively small amount of natural rubber in their content.

  • The difference in distance between the front and rear of a pair of tyres mounted on the same axle.

  • The fronts of two tyres on the same axle are closer than the rears of the tyres.

  • The fronts of two tyres on the same axle are further apart than the rears of the tyres.

  • Also known as Ackerman Angle. A vehicle's wheels on the inside of a turn follow a smaller radius than the tyres on the outside of the turn, because the two front wheels steer at different angles when turning.

  • Turning or twisting effort, usually measured in lb-ft or Newton meters.

  • A long, straight bar fastened to the frame at one end and to a suspension part at the other; acts like an uncoiled spring that absorbs energy by twisting.

  • Material between the bottom of the tread rubber and the top layer of steel belts; acts as a cushion that enhances comfort.

  • A system that maximizes the contact patch area during cornering through a combination of asymmetrical tread patterns and underlying belts.

  • The longitudinal distance from the center of the front wheel to the center of the rear wheel on the same side of the vehicle.