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Tyres |
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Looking after your tyres
Correct inflation
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Tread contact is even |
Tyre will wear in the centre |
Tyre will wear at the shoulders |
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The law requires tyres to be inflated to a pressure appropriate for the application.
Refer to trye pressure displayed on your vehicle. |
Common tyre damages
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Side wall bulge caused by impact |
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Sloped and feathered wear caused by misaligned wheels |
Incorrect wheel camber angles |
Tyre repairs according to British Standards BS AU 159
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| Cross-ply & Radial-ply |
Area 'T' |
Area 'W' |
| All sizes & Speed ratings |
6mm max hole size |
Not allowed |
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| Nominal section width |
Area 'T' |
| Up to and including 155mm |
60% |
| Above 155mm to 200mm |
65% |
| Above 200mm |
70% |
Visual tyre health check
Tyre tread measurements
| Maximum tyre tread |
= |
8mm |
| Minimum legal limit |
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1.6mm* |
| Maximum usable tread |
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6.4mm |
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| Note: Tyres are checked bt taking three reading across the width of the tyre, starting with the outside tread depth measurement. any excessive variance in the three readings, for example 6, 5 and 4 may indicate the need for a wheel alignment check to avoid further excessive wear. |
| * Centre 75% of the tyre breath and around entire circumference |
Remaining tread depth
8mm |
your tyre is |
0% |
Worn |
7mm |
your tyre is |
15% |
Worn |
6mm |
your tyre is |
31% |
Worn |
5mm |
your tyre is |
47% |
Worn |
4mm |
your tyre is |
62% |
Worn |
3mm |
your tyre is |
78% |
Worn |
2mm |
your tyre is |
94% |
Worn |
1mm |
your tyre is |
100% |
Worn |
| Key |
Okay |
Inspect weekly |
Advisory |
Inspect weekly |
Urgent |
Requires attention |
As a rough guide, a millimetre (1mm of tyre tread lasts from approximatley 1,000-4,000 miles, dependant upon driving style, road and weather conditions and tyre rubber compound.
Effect of tread depth on braking distance
Stopping distance v tread pattern depth (100km/h to km/h)
Tyres and the law
Illegal tyre(s) penalty warning
for every tyre offence there is a maximum fine of £2,500, with discretionary disqualification and a compulsory driving licence endorsement of 3 penalty points - cars and light commercial vehicles (up to 3,500kg GVW).
Minimum legal tread depth
Number of faulty tyres |
Maximum Fine |
Penalty Points |
1 |
£2,500 |
3 |
2 |
£5,000 |
6 |
3 |
£7,500 |
9 |
5 |
£10,000 |
12 |
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