How to Read Three Wheeler Tyre Size: A Step-by-Step Guide


Understanding how to read the size of your three-wheeler's tyres is crucial for maintaining safety, performance, and durability. The combination of numbers and letters on the tyre's sidewall might seem cryptic at first glance, but decoding it provides invaluable information for replacement.

Understanding Tyre Size Basics

What the numbers represent

The numbers on a tyre represent its dimensions, including width, aspect ratio, and rim diameter. For instance, a sequence like '185/70 R14' has distinct meanings for each number.

What the letters signify

The letters in the tyre size indicate its construction type, speed rating, and other specifics. 'R' signifies radial construction, while '14' refers to the rim diameter measured in inches.

Decoding the Tyre Size

Breaking down the numbers

The first number, '185,' represents the tyre's width in millimeters. The second number, '70,' signifies the tyre's aspect ratio, indicating its sidewall height as a percentage of the width.

Interpreting the letters

The letter 'R' suggests the radial construction, the most common type in modern tyres. The number '14' denotes the rim diameter, enabling a perfect fit on a 14-inch wheel.

Importance of Knowing Correct Tyre Size

Safety implications

Using incorrect tyre sizes can compromise handling, traction, and overall safety on the road. Understanding the right size ensures optimal vehicle performance and safety.

Performance impact

Correctly sized tyres optimize fuel efficiency, steering response, and overall driving experience. Incorrect sizes can lead to premature wear and reduced performance.

Step-by-Step Guide to Reading Tyre Size

Locating the size information

The tyre size information is typically found on the sidewall, presented in a format like '185/70 R14.' Understanding this sequence is crucial.

Interpreting the numerical values

The numbers represent width, aspect ratio, and rim diameter. Understanding these measurements aids in selecting the right replacement.

Understanding the alphabetic codes

The letters convey construction type and speed rating. Knowing their meanings assists in choosing tyres suitable for your vehicle.

Common Misconceptions about Tyre Sizing

Myth-busting and clarifications

Misconceptions about tyre sizes often exist. Clarifying these can prevent confusion and ensure informed decisions about replacements.

Three Wheeler Tyres

Choosing the Right Replacement Tyre

Matching the correct size

Ensuring the replacement tyre matches the original size is pivotal for safety and performance.

Other considerations

Factors like tread pattern, load index, and climate suitability also influence tyre selection.


Understanding how to read three-wheeler tyre sizes is fundamental for vehicle owners. It impacts safety, performance, and overall driving experience. Being well-versed in interpreting the numbers and letters on the tyre sidewall ensures accurate replacements and optimized driving conditions.