Tyres, wheels, changing a wheel, snow chains
Minimum tread depth, tyre condition and markings, studded tyres, the snow chain requirement and the safe procedure for changing a wheel.
- 26 questions in this topic
- Topic 11 of 16 in the course: Bus & Coach – supplementary theory cat. D and D1
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From the key facts
- Tread depth at least 1.6 mm over the whole tread; the fabric must not be damaged or exposed (VTS Art. 58 para. 4).
- All tyres of the same construction (radial or cross-ply), suitable for the maximum speed; twin tyres must not touch each other (VTS Art. 58 para. 2, 3, 5).
All key facts, the questions with explanations and the exam simulation are part of the course.
Sample questions from this topic
3 of 26 questions free to try. All questions with explanations and the exam simulation are part of the course.
Question 1: What is the minimum tread depth of the tyres of a heavy motor vehicle?
- 3.0 mm
- 1.0 mm
- 1.6 mm
Show answer
Correct answer: 1.6 mm
Pneumatic tyres must have tread grooves at least 1.6 mm deep over the whole tread. 3.0 mm and 1.0 mm are not legal minimum values.
Legal reference: VTS Art. 58 para. 4
Question 2: During the pre-departure check you see exposed fabric on a tyre sidewall. What applies?
- Permissible until the next service
- The tyre is no longer permissible and must be replaced before the journey
- Permissible as long as the tread depth is 1.6 mm
Show answer
Correct answer: The tyre is no longer permissible and must be replaced before the journey
On pneumatic tyres, the fabric must be neither damaged nor exposed, regardless of the tread depth. The driver must make sure before the journey that the vehicle complies with the rules; the vehicle must not be driven with this tyre.
Legal reference: VTS Art. 58 para. 4; VRV Art. 57 para. 1
Question 3: What applies to twin tyres?
- They must have different tread patterns
- The inner tyre may have less than 1.6 mm of tread
- The two tyres must not touch each other unless the manufacturer expressly permits it
Show answer
Correct answer: The two tyres must not touch each other unless the manufacturer expressly permits it
Twin tyres must not touch each other unless the manufacturer expressly permits it. Different tread patterns are not required, and the minimum tread depth of 1.6 mm applies to every tyre, including the inner one.
Legal reference: VTS Art. 58 para. 5; VTS Art. 58 para. 4
Legal references for this topic
The questions in this topic are based on these provisions:
- VTS Art. 58, 60, 63, 90, 114
- VRV Art. 23, 36, 57
- SSV Art. 29