Air Tyre Pressure
This is the amount of air in the tyre. It can be measured in either PSI (pounds per square inch) or Bar (units).
Wheel Alignment
The process which ensures that the wheels, suspension and steering are conforming with the manufacturer's specifications.
Aquaplaning
This is when, instead of driving on the road, the vehicle rides on the water surface, resulting loss of control over the vehicle.
Tyre Aspect Ratio
This can also be known as the profile. It is a way of expressing a tyres height, as a percentage of its width. This is found on the sidewall of the tyre.
Tyre Balancing
This is the process to ensure when the tyre and the wheel spin, the weight is distributed.
Bar Pressure Unit
The metric unit for the
air pressure
.
Tyre Bead
This is a ring of steel to help hold the tyre to the rim.
Tyre Casing
This is the skeleton of the tyre underneath the tread and sidewalls.
Cold Inflation Pressure
This is the pressure of the tyre, before the tyre has heated up from driving.
Contact Patch
This is the area of the tyre which comes in contact with the road.
Footprint
This is the part of the tyre which comes into contact with the road surface.
Tyre Inner Liner
The inner linear prevents air from slipping out of the tyre. This can be used when tubes are not.
Load Index
This is a code located on the tyres sidewall which measure the maximum weight a tyre can carry at the speed indicated.
Tyre Profile
Also known as the aspect ratio, this indicates the height of the tyre as a percentage of the width.
Remould
This is where the tyre has been recycled and remoulded using a new tyre tread.
Retreading
This is where the entire
tyre's tread is replaced and re used
.
Tyre Rim
This is the side of the wheel where the bead (steel) is situated.
Rolling Resistance
This is the energy used to keep the tyre moving at a constant speed.
Run Flats
Run flats
are a type of tyre designed for short distances when they have little or no air pressure.
Section Height
This is the measurement between the wheel rim to the outside tread of the tyre.
Tyre Shoulder
This is the section of the tyre where the sidewall and tread meet.
Side Wall
The part of the tyre between the edge of the tread and the bead (steel).
Tyres Silica
This is a rubber compound which has been designed to help reduce rolling resistance.
Sipes
These are slits in the tread which have been designed to improve grip in wet conditions on the road.
Tyre Traction
The friction between the wheel and the driving surface.
Tyre Tread
This is the front section of the tyre.
Tyre tread
comes into contact with the driving surface.
Tyre Underinflation
This is when a tyre needs more air pressure applied.
Tyre Valve
This is a rubber tube with a metal cap, which allows air to enter, but not leave the tyre.