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Tyre Markings

A tyre marked with 160/70/ZR18 for example.

160 = nominal section width of tyre in mm.

70 = the height of the tyres cross section expressed as a percentage of the width.

Z  = speed category.

R = radial construction.

18 = diameter of the rim to which the tyre should be fitted expressed in inches.

Speed symbols

Inspect for proper inflation, tread wear, and the presence of any damage. Serious injury may result from tyre under inflation/overloading. Proper inflation pressure is necessary for optimum tyre performance, safety and fuel economy. Frequently check tyres (when they are cool) with an accurate tyre pressure gauge. Always maintain inflation pressure recommended by the vehicle manufacturer owner's manual. Higher inflation pressure increases stiffness, which may deteriorate ride and generate unwanted vibration. 

Under inflation is the most common cause of failures in any kind of tyre and may result in severe cracking, component separation or "blowout," with unexpected loss of vehicle control. 
Under inflation increases sidewall flexing and rolling resistance resulting in heat, mechanical damage and increased fuel consumption.

The use of a vehicle with defective (or incorrectly inflated) tyres can result in heavy penalties: · 

Possible prosecution · 
A maximum fine of £2,500 (£5,000 if committed with a goods vehicle) · 
3 penalty points on the driver's licence · 
If the offence results in danger to other road users, heavier road penalties and driving licence disqualification may follow

should be checked for the correct tyre pressure and tread depth. Check your owner's hand book to ensure that tyre pressure is correct for load and speed conditions. The law requires that tyre tread depth should be a minimum of 1.0mmacross 3/4 of the breadth of the tread and in a continuous band around the whole circumference - and that it should meet those requirements for the length of your trip