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Motorcycle Tyres – Learn to Read your Tyre Codes

It is safe to say that motorcycle tyres are the parts of your vehicle that you overlook the most. We can easily explain this phenomenon since they are not in plain sight while riding and you can travel on the same tyres for thousands of miles. All you need to do, from time to time, apart from the occasional misadventure, is to check inflation in them. That being said, they truly are an integral part of your ride. Whether you realise it or not, companies spend hundreds of thousands of dollars in research and development annually.

Read on and learn everything you need to know about your motorcycle tyres. As a bonus, I will also teach you how to read the information and codes imprinted on the sides of the tyres, and I´ll let you in on some awesome accessories I have discovered recently.

Motorcycle tyres

Motorcycle Tyres – An Introduction

First of all, let´s start by stating some cold facts about motorcycle tyres you might not be aware of. Let´s dig right into it:

The history of motorcycle tyres

Tyres were first known as the “pneumatic tyre” (British English spelling). They were invented by John Boyd back in 1888 and were first used on a motorcycle in 1897.

At first, they all used inflatable tubes inside the outer tyre which was attached to rims made of steel and wood. The roads weren´t all that great back then, so as you can imagine this set up wasn´t such a great combination. Riders were plagued by constant ‘flats’ until the 1970s when the first tubeless motorcycle tyres started appearing on the market. These types of motorcycle tyres were made possible with the advent of alloy wheels.

Many technological developments separate the tyres of today from the ones used in the 19th Century, but the principle remains the same. They are still basically rubber tubes inflated with air to enable our motorcycles to travel more graciously and comfortably along the highways.

Motorcycle tyre construction

Motorcycle tyres are not just pieces of rubber in the shape of tubes that sets in your bike wheels. Nowadays they have become an increasingly complex system of layers. There are a number of stages that most motorcycle tyres pass through and only the final component is what we call ‘rubber.’ The product is entirely different from that used in the nineteenth century. The composite used by most major brands today is a mixture of petroleum, acids, chemicals, silicone and carbon black. This composition is what constitutes the outer layer of the modern motorcycle tyre. It is the final layer because it utilises the rest of the layers as a mould to support its shape. The final stage in the whole process is to use heat to vulcanise the entire composition into one single unit.

Belted (B) or Radial (R) Motorcycle tyres?

It is the first parting of the ways related to tyre construction. The choice between belted and radial tyres determines the speed that the motorcycle tyre can sustain. It is not just something you can choose like purple, yellow, blue or black for the colour of your gas tank. While it is true that chronologically, the time period of their invention is different, they are both in commercial use today. Let´s take a look at the main differences:

Motorcycle tyres

Belted – Also known as Bias Ply motorcycle tyres, have plies or layers in a criss-cross pattern. The materials can vary, but the design has been around for over a century. They have an amazing cushioning effect over Radials, and people prefer these tyres for heavy loads. On the other hand, they retain more heat and offer less control at high speeds.

Radial – Radial motorcycle tyres are more modern in design. The carcass is durable and traverse the entire tyre and run perpendicular to each other, and also displays a criss-cross pattern among each other. These materials can be steel, kevlar or polyester. Radial motorcycle tyres are much stiffer than belted tyres and perform better at higher speeds, but this also has a disadvantage in that it makes for a firmer ride too. Radials are the go-to tyre for most manufacturers in the world as they are more durable because the materials inside the treads last longer. They are what you would most likely find in a modern-day, brand-new bike.

Motorcycle tyre types

Well, we first divided motorcycle tyres into two categories. But now we are about to split it even further, into multiple directions; not so much a roundabout, as a multi-exit deviation. We require different categories of tyres depending on how we will use them. For example, the performance we expect for an off-road trip is not the same as that for a high-speed course or even for urban riding. Each environment has different demands.

Sports street – This is, perhaps, the most common of all the tyres. Aggressive city riders, who like taking corners fast in any climate, love these tyres. They are not very durable but are very versatile. This kind of motorcycle tyre usually has excellent traction and stability.

Motorcycle tyres

Touring – These are the most durable of motorcycle tyres as harder rubber defines its material which has pros and cons. On the one hand these tyres can handle cold weather better than sports tyres; on the other hand, they have less grip and tend to handle poorly at higher temperatures.

Track – Normally racing motorbikes use these tyres. They have a triangular profile that gives you more stability when leaning on one side. They are for performance bikes and not for everyday use. There is smooth tread on these tyres, and therefore they have minimal grip especially in wet weather.

Off-road – Although they don´t provide much stability on paved roads, their knobby structure provides optimum grip on dirt tracks. Along with track tyres, this is another of the specialised motorcycle tyres. These tyres can be dangerous if used for regular urban riding.

Amazing accessories I discovered by chance

Remember, when I mentioned at the beginning that I will tell you about some awesome motorcycle accessories? I discovered the Smart Turn System (STS) while I was trying out a set of new tyres on a friend´s touring bike. I thought it was amazing and I kept on wondering, “How come nobody could think of this before!?” What it does is to respond very much like a car would in terms of engaging and disengaging turning lights. If you are a driver as well as a rider, you will appreciate that it is a common mistake to forget to turn the indicator lights off after completing a manoeuvre. The STS accessory automatically disengages your turning lights when you have completed your turn, and you can install it very easily.

Smart Turn System

I most kindly advise you to check if these systems fit your motorcycle, you will not regret giving it a try. All you need to do is to submit your motorcycle details in the form below.


Enter your e-mail details below and STS team will send you compatibility confirmation for YOUR motorcycle.


Our devices are compatible with your motorcycle. Here is your limited time offer.

Once my friend told me about the company that makes the STS, I went looking for them online. I found that they have another great device called the Smart Brake Module (SBM). I felt that they had made this accessory for me. When riding, I regularly ease the throttle and downshift my gears without touching the brake. I find this technique especially useful on the highway for a smoother transition. This little, revolutionary device senses that you have decreased your speed and engages the stop light. I feel much safer now that I am letting the cars behind me aware that I´m slowing down.

Smart Brake Module

Understanding motorcycle tyre codes

Besides the basics like the rim diameter (otherwise it won´t fit your bike), there is much more information written on the side wall of a motorbike tyre. Let´s take a look at the essential four pieces of information you have to know.

You might be thinking right now that you always use the same brand and model of tyre, and so maybe knowing the different codes that tyre manufacturers use is not that important. You could rely on the employees at tyre shops to know their stuff and do their jobs right. But, what if you knew better than them? Knowledge of this kind might save you from a tough situation; knowledge is freedom, and learning about motorcycle tyres is a rider’s freedom.

Direction of rotation

This is the simplest of all the indicators. You will notice that your tyre has an arrow. Well, that is exactly the direction that guides you to turn when going forward.

Load and speed index

This is another straightforward indicator made up of a two-digit number and a letter. You will read something like 58W, which indicates that not only do you have a set of tyres that can reach 270 km/h but also that they can transport up to  520 pounds (236kg) in weight. There are charts for this available in Wikipedia if you want to know the letters, speed limits and loads.

Tube designation

This is, perhaps, the second easiest indicator to read. For example, you might see something like: “Tubeless, tread: 4 plies nylon, sidewall: 2 plies nylon.” What does it all mean? Well, it is relatively easy to decipher: It says that you have a tubeless tyre that has four plies of nylon on the tread and two plies of nylon on the sidewalls. This is very helpful to determine the resistance, durability and stiffness of your current tyre.



The summary usually condenses all the information you can find somewhere on the tyre. Let’s break it down:

  • Tyre width – This number indicates the width of your tyre in millimetres measured from the widest point on each side.
  • Aspect ratio – They calculate your tyre´s aspect ratio using the height of the sidewall and the tyre’s total width and then express it as a percentage.
  • Speed rating – You can go for the chart available online to find these ratings. This is important for those riders who make improvements to their bikes, and it enables them to check whether they need a higher category of tyre for their bike. Also, if you are riding an older model and can´t find the exact replacement for the originals, you can take a look at this chart.
  • Tyre construction – In the “tyres construction” section you will find a very clear explanation of what the letters refer to (90% of the time you will most likely see the letter R).
  • Rim diameter – There is not much to explain. In this section since you must know this information before buying your tyre. Purchasing the wrong rim diameter will be an epic fail since you will not be able to fit it to your bike. Again, for those who change their bikes from stock, bear in mind that sometimes, replacing the front fork, for example, can change the rim diameter you need.

Understanding these codes is undoubtedly beneficial in the long run. There is no way you can remember all the charts, but having them handy is an option. Remember that knowing what you are talking about might save you from a scam.

Motorcycle Tyres


Motorcycle tyres have closely followed and complemented the improvements made in terms of vehicle speed and power over the years. The major motorcycle tyre companies ensure to make faster rides safer, and that’s the reason there is a boost in the ongoing development of engine power. On the contrary, they were there, pushing the limits of innovation time after time. As a result, motorcycle tyres are now the safest they have ever been. Besides safety, they now also incorporate many specialised measures that improve speed, grip and suspension.

All technology and funding applied by these companies towards improvement, research, development and manufacture have paid off. Motorcycle manufacturers expend many staff-hours finding the perfect tyres to match their vehicles.

Now that you know all there is to know about these rubber saviours, you can make the most of your motorbike knowing that you will be safer at all times. Feel free to share this valuable information in riders´ forums or with friends and family. We would also love to hear your own experiences.

Happy riding!

Smart Brake Module

A device that flashes your brake light when engine braking and down-shifting to warn drivers behind.

Smart Turn System

Best motorcycle turn signal module, that cancels turn signals automatically.


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Comment down below


  1. Mike Wileman

    19. March, 2019 at 4:24

    Hello Miha
    I always read with interest your emails and articles (although I haven’t purchased your excellent brake and turn modules yet) but will sometime in the future (my brother and I have 2 Kawasaki Versys 1000 GT’s and tour UK and EU).
    Your article above needs a correction, quote “58W, which indicates can transport up to 58 pounds (235kg) in weight” should read “up to 520 pounds (236kg) in weight” . Many thanks for your emails, best regards…. Mike W (Australia & UK)

    • MihaE

      19. March, 2019 at 9:40

      Hello Mike, thanks for informing me about the mistake. I have already corrected it. I appreciate your kind words and taking the time and pointing out the mistake I made in this blog. Ride safe and stay in touch 😉

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