(NCT) Manual 2010 - Road Safety Authority

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37 NATIONAL CAR TEST (NCT) MANUAL 2010 TYRE SPECIFICATION Tyre Fitment ITEM REASONS FOR FAILURE 1 Tyres fitted to individual axles are not of the same size, aspect ratio or type (i.e. cross ply or radial ply). See note (b) below. 2 Radial ply tyres are fitted to the front wheels but not to the rear wheels. 3 Speed rating of tyres cannot be determined on inspection or is insufficient for maximum legal speed limit. 4 Space saving tyre fitted on an axle. 5 Tyre protrudes beyond bodywork. Direction and Location Tyre type approval 6 Any tyre fitted in the incorrect direction (directional tyres) or wrong side out (asymmetrical tyres). 7 An E-mark or e-mark is not visible on the tyre. NOTES 1. A test should not be carried out on a vehicle with a space-saving tyre fitted on any corner. 2. 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. 3. Unless marked otherwise, “standard” car tyres have a nominal aspect ratio of 82%. Some tyres have an aspect ratio of 80%. These have “/80” included in their size marking e.g. 165/80 R1 3. Tyres with aspect ratios of 80% and 82% are almost identical in size and can be safely mixed in any configuration on a vehicle. Where this is done, Reason for Failure (1) does not apply. 62
NATIONAL CAR TEST (NCT) MANUAL 2010 38 TYRE TREAD Method of Testing Check with a tyre tread depth gauge, that the central three-quarters of the tread pattern has a depth of at least 1.6 millimetres around the full circumference of the tyre. 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. Where the pattern is interrupted by tread wear indicators but has at least 1.6mm overall tread depth, the tyre concerned should not be failed for inadequate tread-depth. 3. The tread pattern means the combination of plain surfaces and groves extending across the breadth of the tread but excludes any tread wear indicators or features which are designed to wear out substantially before the rest of the pattern under normal conditions of use. 4. The owner should be advised of any tyre with a tread depth of less than 3mm or, where the date of manufacture is obvious on the tyre (Item 7 on the tyre illustration in Section 37), a tyre older than six years. Depth of Tread ITEM REASONS FOR FAILURE Depth of less than 1 .6mm in the central three-quarters of the tread pattern. 63
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(NCT) Manual 2010 - Road Safety Authority

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