Why Do You Need a Tyre Upsize Calculator?

Car enthusiasts love upgrading their tyres and alloy wheels to give their vehicle a bold, aggressive look and better road grip. However, changing your tyre size blindly is extremely dangerous. The global automotive safety rule states that the overall diameter of your new tyre should not differ by more than 3% from the company-fitted original tyre. Our Siddhi Tyre Upsize Calculator helps you find the perfect fitment mathematically.

What Happens If You Cross the 3% Safety Limit?

If your new tyre size exceeds the 3% difference limit (either too big or too small), you will face the following problems:

Speedometer Error: Your car might be traveling at 110 km/h, but your speedometer will only show 100 km/h, leading to accidental speeding tickets.

Suspension Damage: Oversized tyres can rub against your car's wheel arches or suspension components while turning.

Mileage Drop: Heavier, incorrectly sized tyres will drastically reduce your car's fuel efficiency.

Braking Failure: ABS sensors calculate speed based on original tyre dimensions. Wrong sizes confuse the ABS system during emergency braking.

How to Read Your Tyre Size for the Calculator

Look at the side of your current tyre. You will see a number like 195/55 R16.

195 (Width): The width of the tyre in millimeters.

55 (Profile): The height of the sidewall as a percentage of the width.

16 (Rim Size): The diameter of the alloy wheel or rim in inches.

Simply enter these three numbers in the "Current Tyre" section, and your desired upgrade numbers in the "New Upgrade" section to generate your instant safety report!

Get Expert Tyre Modification at Siddhi Tyre

Found a safe size in green? Perfect! But installing new tyres and alloys requires precision. At Siddhi Tyre, we use advanced computerized wheel balancing and 3D alignment machines to ensure your new wheels run perfectly smooth. Visit our shop today or chat with us on WhatsApp for pricing on top brands!