What is the allowable minimum depth of the thread in a tire not fitted with a tire indicator bar.
Show the correct answer
Correct answer
A. 1.6 millimetres.
Explanation
The minimum permitted tread depth of a tyre without a wear indicator is 1.6 millimetres - answer A. The values 2.6 mm (B) and 3 mm (C) are not the legal minimum, although for winter a tread of at least 4 mm is recommended.
The Regulation on the technical conditions of vehicles states that a vehicle must not be fitted with tyres whose indicators show the limit of tread wear, and in the case of tyres without such indicators - with tyres whose tread pattern depth is less than 1.6 mm. The tread grooves drain water from under the tyre; with 1.6 mm on a wet road, aquaplaning starts already at moderate speed, so tyres are replaced earlier, and the depth is checked with an ordinary coin or a gauge.
Legal basis: § 11 para. 7 point 4 of the Regulation on the technical conditions of vehicles and the scope of their necessary equipment