Tyre Knowledge Quiz

The legal minimum tyre tread depth for passenger cars and trailers up to 3500kg GVW is:

• 1mm for 75% of the tread width for the complete circumference of the tyre

• 16mm for 75% of the tread width for the complete circumference of the tyre

• 0.16mm for 75% of the tread width for the complete circumference of the tyre

• 1.6mm for 75% of the tread width for the complete circumference of the tyre

Which of the following is an indication that the front wheels may require balancing?

• Heavy wear on the outer edges of both front tyres

• Sever feathering of both the front tyre treads

• Heavy wear around the centre section of the tyre tread

• Steering wheel vibration that increases with vehicle speed.

A Tyre has a side wall marking of ‘195/65 R 16’. This means

• The tyre has an aspect ratio of 65 mm

• The tyre has a section height of 16 inches

• The wheel diameter is 195 mm

• The tyre has an aspect ratio of 65%

An over inflated tyre will tend to wear:

• Overheat with prolong usage

• On the centre part of the tread

• On the outer edge of the tread

• By feathering of the tyre tread

The side wall marking of a tyre is 195/65 R 15. This means that:

• The tyre is a cross-ply construction design

• The section height of the tyre is 126.75 mm

• The tyre is fitted with a 195 mm diameter wheel

• The diameter of the tyre is 15 inches.

P195/65 R 15 H 84. State what the number 84 represents:

• Speed rating

• Load index rating

• Aspect ratio

• Wheel diameter

P195/45 R 15 H 84. What is represented by the number 45:

• Wheel diameter

• Speed rating

• Aspect ratio

• Tyre width

P195/65 R 15 V 84 What is represented by the letter V:

• Speed rating

• Load index rating

• Tyre width

• Tyre construction

The legal minimum tyre tread depth for passenger cars is:

• 1.6mm for 75% of the tyre tread width for the complete circumference of the tyre

• 0.16mm for 75% of the tyre tread width for the complete circumference of the tyre

• 16mm for 75% of the tyre tread width for the complete circumference of the tyre

• 1mm for 75% of the tyre tread width for the complete circumference of the tyre

A tyre is worn below the legal limit down both outer edges, this may indicate that the tyre:

• Requires balancing

• Pressure is below the recommended setting

• Pressure is above the recommended setting

• Has the incorrect speed rating for the vehicle