Wheels and Tyres 3/03/21

Wheels and Tyres 3/03/21

To understand the construction and terminology associated with wheels and tyres

Multiple Choice

Which one of the tyres below is asymmetrical

Multiple Choice

Which tyre size has 17 inch diameter wheels

• 195/65/R16

• 185/45/R18

• 175/65/R15

• 215/45/R17

Multiple Choice

The law requires car tyres to have a minimum tread depth of

• 1.0mm across the central three-quarters of the width of the tyre and around the entire circumference

• 1.5mm across the central three-quarters of the width of the tyre and around the entire circumference

• 1.6mm across the central three-quarters of the width of the tyre and around the entire circumference

• 1.3mm across the central three-quarters of the width of the tyre and around the entire circumference

Multiple Choice

It does not matter which way round directional tyres are fitted

• True

• False

Multiple Choice

All vehicle tyres are the same and can be fitted to any vehicle

• True

• False

Common Types of wheel

• Alloy wheels

• Pressed steel

• Space saver

• Split rim

Multiple Select

3 reasons Alloy wheels are used

• Light ( lowers unsprung weight )

• looks good

• Its strong

• adds BHP

• better road handling

Main construction of radial and cross ply tyres

The casing consists of plies which are looped around the beads to form a case. The difference in structure is the arrangement of the plies.

3 advantages of a radial tyre

• less rolling resistance giving better fuel economy

• improved tread life

• improved traction (grip).

Multiple Choice

Which of the following is a means of indicating tyre wear?

• Wear bars in tyre tread

• Pressure sensor inside tyre

• Self sealing compound inside tyre

• Special service tyre

Multiple Choice

There are two main types of tyre construction: radial and cross ply.

• True

• False

Tyre tread

Symmetrical - deliver smooth driving, high directional stability, and low rolling resistance. Directional - provide high protection against aquaplaning, excellent handling on snow and mud, and very good road-holding at high speeds.

Asymmetric - offer excellent handling, high curve stability, and good grip in wet conditions.

Tyre tread pattern design

• Tread compound: grip, wear rate, flexibility, rolling resistance, etc.

• Circumferential grooves: steerability and water dispersal

• Cross ribs (lateral notches): traction and mud evacuation

• Blocks: provide high mileage performance and good grip

Multiple Choice

which vehicle most suits block tread pattern ?

• family car

• off road vehicle

• high performance

• a camel

Multiple Choice

which vehicle most suits symmetric tread pattern ?

• High performance

• off road vehicle

• family car

• tractor

Multiple Choice

which vehicle most suits an asymmetrical tread pattern ?

• off road vehicle

• High performance

• family car

• wheel barrow

Tyre bead

Tyre beads sit on the wheel and seal the air inside

Tyre markings

• M+S = Mud and snow

• P = passenger car

• 215 = tyre width in mm

• 65 = aspect ratio

• R = radial

• 15 = rim diameter (inch)

• 95H = load index and speed rating

Multiple Choice

Which of the following is a means of indicating tyre wear?

• Wear bars in tyre tread

• Pressure sensor inside tyre

• Self sealing compound inside tyre

• Special service tyre

Multiple Choice

What are the beads of a tyre usually constructed from?

• Steel wire

• Nylon

• Fibreglass

• Neoprene

Poll

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