Asymmetric tread - Improves handling when cornering, marked inside and outside on tyre sidewall, TWI - Tread wear indicator set at 2mm depth, Radial - Plies come off the bead at 90 degrees, Crossply - Plies come off the bead at 40-45 degrees, Rotational tyre tread - Disperses water in one direction of rotation only, must be fitted on correct side of vehicle, 5107 - The first number is the week and the second number is the year the tyre was manufactured, Tyre size - Tread width 185mm, aspect ratio 75%, wheel diameter 14 inches, Centre tread wear - Tyre wear caused by over inflated tyre, Tyre pressures - Measured in psi and bar, Advantages of an alloy wheel - Lighter and better air flow to the brakes, Inner and outer edges of tread worn - Tyre wear caused by under inflation of tyre, Schrader valve - Allows air to be added and removed from the tyre, Steel wheel - Poor air flow to brakes and heavy but cheaper to manufacture, Wheel well - This is used to allow the tyre bead to be eased over the rim, Space saver wheel - Must be driven at reduced speed over short distances, Static imbalance - Imbalance that may cause the wheel and tyre assembly to tramp, Dynamic imbalance - Imbalance that may cause the wheel and tyre assembly to shimmy, Run flat tyres - Reinforced side walls support the weight of the vehicle if the air has escaped,

Wheels and Tyres

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