NCT Manual. - National Car Testing Service

37
NATIONAL CAR TEST (NCT) MANUAL 2012
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, radial-ply, runflat,
winter or summer)” . See note 3 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.
6 Tyre is not fit for purpose, e.g. marked “For Trailer Use Only” or similar.
Direction and Location
Tyre type approval
7 Any tyre fitted in the incorrect direction (directional
tyres) or wrong side out (asymmetrical tyres).
8 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