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The rear tyre size is denoted by 140/60-R 17. The number 140 tell us that the tyre is 140mm at its widest point, while the second number, 60, denotes the tyre's sidewall height is 60% of the width of the tyre. The number 17 tells us that this tyre is for a rim size of 17 inches.
Tyres are the only contact your two-wheeler has with the road while in motion. It is, thus, extremely important to ensure that the tyres installed on your two-wheeler are of the correct specification, or there may be some very undesirable consequences. For example, a tyre which is too wide, if installed on a commuter bike would reduce not just its acceleration and efficiency but also make it dynamically unstable despite having a wider contact patch. On the other hand, a slim tyre installed on a high performance machine would get shredded to bits before you know.
In order to ensure that the specification of a tyre could be clearly defined by a manufacturer, and understood by the end consumer, there’s a well defined nomenclature for tyres. All tyres made by credible manufacturers come clearly marked with codes denoting details about all the critical parameters defining their capability. In this guide we’ll tell you everything about how to read two-wheeler tyre markings, and why they are important.
Size, load and speed rating
Let’s take this tyre image as an example. The size, load and speed markings on the sidewall read 180 / 50 R17 71 W
Tyre width - the first two or three digits of the marking represent the section width in millimetres, measured from the widest parts of sidewall to sidewall (not the contact patch) with the tyre inflated to its correct specification. So the number 180 in our example represents a 180mm wide tyre. This is followed by a forward slash ‘/ ‘ for separating the next number.
Aspect Ratio or profile - The next digits denote the aspect ratio. This represents the height of the sidewall or the ‘profile’ of the tyre. Aspect ratio is typically denoted as a percentage of the section width of the tyre. In our example it’s 50, which means that the height of the tyre’s sidewall is 50% of its nominal sectional width or less.
Tyre construction - Sometimes (but not in all cases) the aspect ratio is followed by a code indicating the construction type of the tyre. The code is represented by a letter from the alphabet, and this is what it means
B - bias belt or bias ply construction
D - Diagonal tyres made of nylon cords placed diagonally across each other in the tread and sidewall.
R - Radial tyres
Wheel diameter
The next set of digits represents the diameter of the wheel in inches. In our example it’s 17, which means that the tyre is meant for 17 inch wheels.
6 окт 2024
