Theory Mastery

Karkas zichtbaar verboden

A tyre in which the carcass is visible is rejected, however much tread is left on it. A tyre with a visible carcass fails at any moment, however much tread is left.

Source: WVW 1994 art. 5 · checked 2026-10-23

How the exam asks it

In the garage in Apeldoorn the mechanic measures your rear tyres: tread depth 2.0 mm in the main grooves, both the same size, no visible carcass — but one tyre has a clear bulge on the side. Is this tyre approved?

  1. No — a bulge is its own independent failure ground, separate from tread, size and carcass
  2. Yes — tread, size and carcass are fine, so the tyre is approved
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Correct answer: No — a bulge is its own independent failure ground, separate from tread, size and carcass

Bulges are their own independent requirement (the law); even without carcass damage the tyre fails.

Why learners get this wrong: As long as tread depth is 1.6 mm or more, it does not matter if the carcass of the tyre is visible somewhere.

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About Tyres: tread, size and damage each count separately: which statement is WRONG?

  1. When measuring tread depth, you simply count the height of the wear indicators as tread.
  2. Tyres on one axle must have the same size designation, except when an emergency or spare wheel is used.
  3. Tyres may not show damage where the carcass is visible, independent of how much tread remains.
  4. Driving a vehicle that causes or may cause danger on the road is prohibited at all times, not only on the day of the APK.
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Correct answer: When measuring tread depth, you simply count the height of the wear indicators as tread.

The tread must be at least 1.6 mm, WITH THE EXCEPTION of wear indicators. Those therefore do not count in the measurement

Why learners get this wrong: You may always fit different tyre sizes on one axle, as long as both tyres individually have enough tread.

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The tread must be at least 1.6 mm, WITH THE EXCEPTION of wear indicators.

  1. False
  2. True
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Correct answer: True

The tread must be at least 1.6 mm, WITH THE EXCEPTION of wear indicators. Those therefore do not count in the measurement

Why learners get this wrong: When measuring tread depth, you simply count the height of the wear indicators as tread.

Open this question

About Tyres: tread, size and damage each count separately: which statement is correct?

  1. The tyre requirements (tread, damage, bulging) are only checked at the annual APK inspection; in between it does not matter.
  2. Tyres on one axle must have the same size designation, except when an emergency or spare wheel is used.
  3. As long as tread depth is 1.6 mm or more, it does not matter if the carcass of the tyre is visible somewhere.
  4. When measuring tread depth, you simply count the height of the wear indicators as tread.
Show the answer

Correct answer: Tyres on one axle must have the same size designation, except when an emergency or spare wheel is used.

Tyres on one axle must have the same size designation, except when an emergency or spare wheel is used. Enough tread on both tyres alone is therefore not sufficient

Why learners get this wrong: The tyre requirements (tread, damage, bulging) are only checked at the annual APK inspection; in between it does not matter.

Open this question

About Tyres: tread, size and damage each count separately: which statement is WRONG?

  1. Tyres may not show damage where the carcass is visible, independent of how much tread remains.
  2. Driving a vehicle that causes or may cause danger on the road is prohibited at all times, not only on the day of the APK.
  3. You may always fit different tyre sizes on one axle, as long as both tyres individually have enough tread.
  4. The tread must be at least 1.6 mm, WITH THE EXCEPTION of wear indicators.
Show the answer

Correct answer: You may always fit different tyre sizes on one axle, as long as both tyres individually have enough tread.

Tyres on one axle must have the same size designation, except when an emergency or spare wheel is used. Enough tread on both tyres alone is therefore not sufficient

Why learners get this wrong: As long as tread depth is 1.6 mm or more, it does not matter if the carcass of the tyre is visible somewhere.

Open this question

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