What Do The Tyre’s Markings On Sidewall Represent?

 Product October 27, 2023

Dimensions and Features of Motorbike Tyres:

When it finally happens for a biker to set up the new road or race tyres on their motorcycle, they typically give minimal regard to the function that the size and form of the tyre truly accomplish for them. The very last pair functioned well, so the reason they have to learn, I would assume, is why this ought to be the case.The response is no, really, however, a tyre’s diameter and design may influence how your motorbike travels and behaves, and certain riders could gain from a tiny difference up.When we examine the capabilities of various motorcycle tyre sizes, let us just look at what each of the symbols and numerals on the sidewall of the tyres implies.


The additional latex strip that connects the surface and seam is what offers your tyre dynamic support. Also, you can read all the company’s details regarding your tyre there. However what does a designation like 190/50 ZR 17 M/C (73W) TL  truly mean? Here is a brief explanation on how to interpret these markings:

190/50 ZR 17 M/C  (73W) TL


The initial value represents the tyre’s width in millimetres, measured from its widest part.


The second value represents the tyre’s ratio, often known as elevation. This is shown as a proportion of the tyre’s width. So, in this instance, the elevation of the tyre is equal to 95mm, or 50% of 190mm.


The script has two-speed values, the first of which is this. It shows the maximum velocity at which the tyre can be accelerated. Inside this case, “Z” indicates that the tyre is appropriate for speeds of more than 149 mph. Nevertheless, it omits to include the tyre’s maximum permissible pace; such information is found elsewhere in the program, in parenthesis.


The letter “R” stands for the tyre’s building component. A tyre’s circular structure is indicated by the letter “R” on it. The other most popular construction type, as well as radial tyre, are briefly explained here:

A tyre with its wire flanges placed perpendicularly (at a 90-degree angle) to the motion’s direction is referred to be radial.

Belted(‘B’) – A bias tyre that has been belted (abbreviated “B”) begins life as a typical bias-ply tyre. Later, stabilizer belts are layered at various angles on the top of the currently installed plies. This enhances performance when compared to bias-ply tyres without a belt (also called cross-ply).

It’s going to be a bias-ply tyre if it lacks both of these characters.


The following value indicates the tyre size in inches that the tyre fits. In this instance, the tyre will fit a rim with a 17-inch diameter.


This merely indicates that the tyre is appropriate for usage on motorcycles.


The load index of the tyre, which indicates the load capacity it can carry, is represented by the numerical part of the letters in parenthesis. You must use a load index table to figure out what value this number represents. Figure 73 indicates that the tyre can support a load of up to 365kg, which is apparent.


The additional pace classification on the tyre is indicated by the letter “W” in parenthesis. Merely described, a tyre’s maximum legal speed is influenced by the weight you apply to it. The “W” is paired with the weight rating (73) because this is the tyre’s cruising speed while it is carrying the most weight possible.


TL denotes that the tyre is tubeless. If you notice “TT,” it means the tyre is a tube-type tyre, hence an internal tube is required.

Tread Pattern :

Typically, a tyre’s height and width (for example, 190/50) determine its profile. Nonetheless, certain producers, like Bridgestone and Dunlop, are reputed to have sharper edges than rival companies .

As previously said, the pointier the tyre, the more quickly it will seem as though it is interested in turning in. For instance, a 180/60 tyre will provide you with a faster turn rate than a 180/55 tyre.

A pointed tyre has the additional advantage of providing you with a large interfacial patch when you lean over again and curve on the edge of the tyre, encouraging helps in improving the quality angles and quicker turning acceleration.

Various tyre parts:


The apex, which rests on top of the bead, is utilised to stiffen the sidewalls. The substance and design of the apex have a significant impact on how a tyre responds and performs.


The beads provide an unbroken barrier between your tyre and the rim of the wheel and are constructed of elevated twisted steel covered in rubber.


Between the exact middle and the sidewall of the tyre is the shoulder region. When the bike is able to lean over, the design and structure of the shoulders are crucial.


To increase stiffness, decrease kinetic expansion at pace, and enhance durability, steel or aramid belts are wrapped all around the tyre.


Your tyre’s skeleton is composed of several layers of a material called plies, which are normally constructed from strands of fibre that have been braided around and coated with rubber. They enable the flexibility but not the elasticity of your tyre. Your tyre’s strength comes from one or more carcass plies that are positioned right above the inside lining.


When the rubber hits the road, this is the squishy part of your tyre. The shape and composition of the tread, which offers both cushioning and traction, influence a number of the most crucial functional characteristics of your tyre. For the middle and shoulder areas, the tread can have various compositions.


The dimensions and form of the tyre you choose should depend on your riding style and the tyre’s requirements. Do you enjoy how a wider, less pointed tyre leaves you feeling smoother and more steady? Or do you prefer it when the bike falls into the turn and you’re less concerned with minor swivels on the straight ones? The ideal tyre diameter and pattern is solely determined by you.


1. How Important Is Tyre Size?

Generally said, the more traction your car has on the roadway, the bigger the tyre. A tyre’s breadth determines how much of the ground it can cover. iSee Cars claim that this increased touch with the road offers your car further to grasp onto, improving control and mobility.

2. when to replace a bike’s tyres?

While bicycle tyres do have an average life expectancy, several different factors determine whether to update them. Whether it be a mountain bike tyre or a road cycling tyre, a bicycle tyre typically lasts for 3,000 to 4,000 miles. Yet, there are replacement indicators that are far more important than how many miles you have ridden them, such as the lack of tread, wear and tear, rubber splits, sidewall cuts, and poor performance. The tyres on your bicycle are an essential element since they have a big effect on performance, safety, convenience, and how you feel while riding. For illustration, the control of the bicycle is impacted by waves generated by a thin tyre patch.


Dimensions and tyre designs By Life at Lean

Aspects and tyre patterns By Dunlop