NCT Manual. - National Car Testing Service

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NATIONAL CAR TEST (NCT) MANUAL 2012
TYRE CONDITION
Method of Testing
1. Check whether the tyre tread appears to have been recut.
2. Check visually that the tyre is correctly seated on the wheel rim.
3. Examine the tyre for:
(a) any cut or break in the fabric.
(b) any lump or bulge.
(c) any exposure of the ply or cord structure.
4. Examine the valve stem for distortion or chafing.
NOTES
1. Any tyre or wheel examination must be performed with the vehicle raised on the lift to ensure that all
parts of the wheel and tyre can be examined thoroughly.
2. Examination is confined to tyres fitted to the road wheels. If, however, any defect on a tyre carried on a
spare wheel is seen, the driver should be advised.
3. Tyres designed for recutting or regrooving will normally be marked as regroovable.
4. The evidence of any tyre wear or damage in the full lock and full suspension bounce conditions should be
noted when making the ratings above (see also Reasons for Failure No. 29 page 70).
Tyre Structure
Valve
Repairs
ITEM
REASONS FOR FAILURE
1 Evidence of recutting of tread pattern where
tyre is not suitable for recutting.
2 Incorrectly seated on wheel rim.
3 Any cut longer than 25mm or 10% of section width (whichever is
shorter) and which is deep enough to reach the ply or cords.
4 Rupture in or exposure of ply or cord structure, tread lifting,
lump or bulge caused by separation of rubber from cords or
weakness in cord structure, or tread distorted or damaged.
5 Obvious damage or distortion of the valve stem.
6 Valve stem chafing against valve hole.
7 Repair plug fitted in the sidewall.
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