Correct tyre pressure is the single most important aspect to the life of a tyre. It is best to follow the vehicle manufacturer's recommended pressure settings on the tyre placard. The placard can be found on the inside of the driver's door, the fuel flap or the glove box. Check your pressures monthly and when your tyres are cold. Ensure that the valve cap is secured tightly.
Look out for any irregular wear pattern across the tread of all the tyres. A tyre's tread should wear relatively evenly and smoothly. Inspect the side-wall and tread for any cuts or lumps or bulges. Old tyres can sometimes crack and perish before tread is worn down.
All tyres have a tread wear indicator stamped within the tread base of the tyre. These are marked most commonly with “TWI” on the shoulder of the tyre (where the tread meets the side-wall). Follow this marking onto the face of the tread and you will see small, raised sections. These are 1.6mm high and when your tread reaches this point, the tyre is no longer roadworthy and needs replacing.
It is worth noting that once tread goes below 3mm, wet weather performance starts to diminish significantly. Major tyre manufacturers recommend replacement at 3mm.
Most punctures up to 6mm can be repaired safely if done internally with a “patch and plug” combination. This process inspects the tyre internally for damage which cannot be seen from the outside and seals the hole to the tyre carcass to ensure safe driving.
Tyres cannot be repaired if the tyre is no longer roadworthy. The main reasons are the hole is larger than 6mm, the damage is on the shoulder or side-wall or the tyre is worn below 1.6mm.