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Numbers On Tires
All about tyres, what is the meaning of
numbers on the Tyre? What is inside the Tyre?
Tyre, the basic unit of our vehicle was invented first in 1847 lodged by the Scottish inventor Robert William Thomson.
Today’s world, there are variety of tyres you can buy depending
on what their specialist applications are is long and varied.
Having a right type of tyre in a vehicle is very important, so in this
article we will read about different types of tyre and its uses.
What is a Tyre?
Tyre is a ring-shaped structured wheel which is used to
transfer the vehicle load to ground.
Since their invention natural rubber is the most widely used material
in manufacturing of tyres.
At present time these circular rings are made up of rubber, chemicals,
fiber, and chemical compounds.
What is the meaning of numbers on tire?
1 Cross section width 195
The first three numbers, in this case 195, refer to the section width
of the tyre. This is the measurement, in millimetres, from the tyre’s inner
sidewall to its outer sidewall.
2 Aspect ratio
The next 2 numbers 55 means the height is equal to 55% of the 195mm
width. The bigger the aspect ratio, the bigger the sidewall will be.
3 Construction type
The letter R means the tyre is a radial construction. Almost all new
car tyres are radials. In radial tyres the cord plies are arranged at 90
degrees to the direction of travel, or radially.
4 Rim
The number to the right of the construction type is the rim diameter,
measured in inches. In this case, it’s a 16” wheel.
5 Load index
The final number is the load index i.e. the maximum load (in kg) that
the tyre can carry.
What is inside the tyre?
Thread: The tread of a tire or track refers to the rubber on its
circumference that makes contact with the road or the ground.
Bead: the bead is a rubber-coated steel
cable whose function is to ensure that the tire remains attached to the wheel
rim.
Layers: These different layers are known as
plies. Each layer is a different type of fabric. Polyester cord is the most
popular ply fabric.
Belts: It is made up of steel and is meant to provide
reinforcement to the section that’s directly underneath the tread.
Sidewall: It is made up of various natural and sidewall
prevents air from escaping and keeps the body plies protected
What are the functions of tyres?
§ To
maintain contact between vehicle and ground by providing desired traction.
§ To support the load of vehicle.
§ Dealing
with various forces acting on vehicle during its motion.
§ Providing
cushion against shocks and damping them.
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