MS3 -Chassis Tyres

What do the numbers 225 mean?

• The width of the tyre in MM

• The Circumference of the tyre in CM

• The width of the tyre in CM

• The chemical compound of the tyre

The number 50 relates to....

• The maximum speed the tyre can travel

• The height of the tyre sidewall in MM

• The profile of the tyre expressed as a percentage of the width

• The diameter of the wheel

The profile is the height of the tyre From the "Bead" to the "Shoulder" expressed as a percentage of the width, So what is the height of the tyre in the picture if the tyre size is 195/55/R16

• 100cm

• 195mm

• 55mm

• 107.25mm

What Does R stand for?

• Rotational

• Radical

• Radial

• Rain tyre

What does 17 Stand for?

• The circumference of the tyre in Inches

• The diameter of the tyre in inches

• The width of the tyre in inches

• The height of the tyre in inches

If a tyre is marked as a ZR rated tyre, What does that mean?

• The tyre is rated in excess off 149 mph

• The tyre is rated up to 149 mph

• The tyre is suitable for heavy vehicles

• The tyre can only be used on a race track

What is the legal minimum tread depth for a car tyre in the UK?

• 3mm

• 1mm

• 2mm

• 1.6mm

You are checking the age of a tyre ready for fitment to a customers car the Numbers are 0309, What should you do.

• Fit the tyre, It looks ok.

• Dispose of the tyre. It is over 10 years old.

• Inform the customer and let them make a decision.

• Scrub the numbers of and fit it

Can slick tyres be used on a public road

• Yes if the driver is aware of his responsibilities

• Yes slick tyre improve grip in good conditions

• No! The legal minimum tread depth in the UK is at least 1,6 MM

• All tyres must have tread across 100% of the tyre width

Tyres are made up from different compounds of rubber. this affects both wear and durability normally this is understood in the following terms

• Soft Compounds give excellent grip but have short tyre life, Hard compounds last longer but do not produce ultimate grip

• Soft compounds are only used on race cars

• Hard compound have outstanding grip and last longer than soft compound tyres

• The compound of the tyre has no effect on the vehicle handling