Tyre Sizes Explained: What Do Those Numbers Mean?
If you’ve ever looked closely at the sidewall of a tyre, you’ve probably noticed a confusing string of numbers and letters like 195/65R15 or 225/45R17. At first glance, they may seem like a secret code — but once you know how to read them, you’ll understand exactly what tyre size your vehicle needs. In this post, we break it all down in simple terms so you never have to guess again.
What Does a Tyre Size Look Like?
Let’s take an example: 195/65R15. Each part of this code has a specific meaning:
- 195 – This is the width of the tyre in millimetres, measured from sidewall to sidewall.
- 65 – This is the aspect ratio, which tells you the height of the sidewall as a percentage of the width. In this case, the sidewall is 65% of 195mm.
- R – This letter stands for Radial, which refers to the internal construction of the tyre. Most modern tyres are radial tyres.
- 15 – This is the diameter of the wheel (the rim) in inches that the tyre fits on.
So, 195/65R15 means the tyre is 195mm wide, with a sidewall height 65% of that width, built with radial construction, and designed to fit a 15-inch wheel.
Why Tyre Size Matters
Using the wrong tyre size for your vehicle can affect your speedometer accuracy, fuel efficiency, and overall safety. If your tyres are too wide or too tall, they can rub against the wheel well or suspension. Too narrow, and you risk reduced traction and stability. Always refer to your vehicle’s manual or tyre placard (usually found on the driver’s side door frame) for the correct size.
Can I Change My Tyre Size?
Yes — but with caution. Some drivers opt for plus-sizing, which means fitting a tyre with a larger rim diameter while adjusting the sidewall height to keep the overall tyre diameter consistent. While this can enhance performance or appearance, it must be done carefully to avoid mechanical issues or voiding your insurance.
When in Doubt, Ask Us
At Somekind Limited, we help customers every day find the right size for their vehicles — whether it’s a compact car, SUV, or commercial truck. Bring in your old tyre or send us a picture, and we’ll guide you to the best fit.
Conclusion
Tyre sizes might look confusing at first, but once you understand what each part means, choosing the right tyre becomes simple. Whether you’re replacing one tyre or all four, getting the correct size is crucial for your vehicle’s safety, performance, and handling.
Need help identifying your tyre size?
📞 Call us or 💬 WhatsApp a photo of your current tyre — we’ll take it from there.
