WHY? there is printing on tyres

Mechanical

WHY ?

Hello guys this is the question which bother everyone when they are watching anything or see anything today the topic is :- 

lets start with simple   

why there is printing on tyres. I mean what does the meaning of printing words on tyres'

NOW lets get started take example of this tyre👆🏻👆🏻👆🏻

Actually, there is a meaning of these wording printed on tyres 

Let’s take a look at what each number or letter stands for, one by one, in the order they appear in your tire size data. We'll be using this tire size as an example: P235/55R18 100V

WIDTH

The first number to appear in your tire size information is the width, in millimetres, of the correct tires for your vehicle: P235/55R18 100V.

Tire width always refers to the measurement from one sidewall to another. Thus, a tire with the measurement “P235” is for a passenger vehicle and has a nominal width of 235 millimetres.

ASPECT RATIO

After the slash mark, the next number you see is for the tire’s aspect ratio, which essentially tells you how tall your tire’s profile is: P235/55R18 100V. Aspect ratios are delivered in percentages. Tire makers calculate the aspect ratio by dividing a tire’s height off the rim by its width. If a tire has an aspect ratio of 55, it means the tire’s height is 55% of its width.

CONSTRUCTION

After the aspect ratio comes a letter that indicates the type of internal construction maintaining your tire’s stability: P235/55R18 100V

There are two types of construction that you may see on the sidewall of a tire:

·         R – Radial

·         D – Diagonal or Bias Ply

Radial tires represent the vast majority of tires on the road in the United States today; thus “R” will usually be shown in the tire size designation. Radial construction means the tire’s internal ply cords are oriented in a radial direction, from one bead over to the other, essentially perpendicular to the axis of rotation.

RIM DIAMETER

The next number is the diameter code, in inches, of the rim onto which the tire can be mounted. For example, a tire with the P235/55R18 100V would fit a rim with a 18-inch diameter.

 LOAD INDEX

The next figure in the sequence is your tire’s load index, which tells us how much weight, in pounds, the tire can support when fully inflated: P235/55R18 100V

We call it the load “index” because the number doesn’t tell us the precise number of pounds the tire can carry, at least not by itself. However, the number does correspond to a specific load capacity listed in an index. Beginning with 1 and ending with 150, numbers in the load index represent carrying capacities of 99 to 7385 lbs.

SPEED RATING

The final figure in a tire size sequence is the speed rating, which is indicated by a letter: P235/55R18 100V. Just as your load index number corresponds to a particular load, your speed rating letter corresponds to a particular speed capability based on a standardized laboratory test.

For example, a tire with speed rating “S” is rated for up to 112 mph, while a tire rated “R” is up to 106 mph. V rating is the next step for speeds up to 240 kph. Z, W and Y are ratings for speeds over 240 kph. The rating is the speed the tire has been tested to for continuous safe driving. The English equivalent speed for H-rated tires is 130 mph and V-rated tires are good for up to 149 mph. Remember that this isn’t a recommended cruising speed. Of course, you should always follow legal speed limits on roadways.

Tires with higher the speed ratings, tend to offer increasing handling performance. Replacement tires must have the same or higher speed rating to maintain vehicle speed capability. If a vehicle has tires with different speed ratings, it is the speed rating of the “slowest” tire that dictates the vehicle top speed.