Tyre Upsize Calculator

Calculate Your Ideal Tyre Size Upgrade with Our Easy-to-Use Tyre Upsize Calculator! Are you looking to improve the performance, style, or grip of your car's tyres? To determine the safest tire size options for your vehicle, use our simple and free Tyre Upsize Calculator. Simply enter the dimensions of your current tyres to receive fast recommendations for upsize sizes without sacrificing safety or ride quality. Our tool only suggests adjustments that fall inside the permitted tolerance range (less than 2%), adhering to industry norms. Tyre N Tyres makes upsizing easy and risk-free, whether your goal is better handling or a sportier appearance.

Calculate Your Ideal Tyre Size Upgrade with Our Easy-to-Use Tyre Upsize Calculator!

Guide to Tyre Sizing

Tyre Upsize Calculator
Current Wheel / Tyre New Wheel / Tyre
/ R / R
Current RR mm New RR mm
Current Circumference mm New Circumference mm
Difference in circumference mm or %
Tyre N Tyres recommends an Upsizing only if the difference if less than 2%
So when your speedo reads 70mph, you're actually travelling at mph

Calculating Tyre Dimension's (Overall Diameter)

Width x Aspect Ratio = Section Height

Section Height x 2 = Combined Section Height

Combined Section Height + Wheel Diameter = Tyre Diameter

Example: 185/60HR14

185mm x .60=111mm

111mm x 2=222mm

222mm + 355.6mm(14")= 577.6mm or 22.74"

The first number is the width of the tyre in millimeters, measured from sidewall to sidewall. To convert to inches, divide by 25.4 In the example above, the width is 185mm or 7.28".

The second number is the aspect ratio. This is a ratio of sidewall height to width. In the example above, the tyre is 7.28" wide, multiply that by the aspect ratio to find the height of one sidewall. In this case, 185x0.60=111mm or 7.28"x0.60=4.36".

The last number is the diameter of the wheel in inches.

To figure the outside diameter of a tyre, take the sidewall height and multiply by 2,(remember that the diameter is made up of 2 sidewalls, the one above the wheel, and the one below the wheel) and add the diameter of the wheel to get your answer.

Conversion Of Ply Rating To Load Range Desigination

LOAD RANGE REPLACES PLY RATING
A 2
B 4
C 6
D 8
E 10
F 12
G 14
H 16
J 18
L 20
M 22
N 24

Frequently Asked Questions

Tyre upsizing impacts rolling diameter, sidewall height, and overall vehicle dynamics. A Tyre Upsize Calculator helps you compare your current size with new options using safe variation limits (generally within ±3%). This tool is more reliable than guesswork, especially for customers referring to our Car Tyre Size Chart and Bike Tyre Size Chart online.

Upsizing your tyres can be safe and even beneficial—if done correctly. Using the Car Tyre Upsize Calculator or Bike Tyre Sizes Calculator from Tyre N Tyres helps you choose tyre dimensions that won't affect your vehicle's performance, suspension, or safety systems.

Of course! Our Car Tyre Upsize Calculator is designed to work for nearly all car and bike models. Whether you want a wider tyre for better grip or just want to enhance the look, this tool helps you do it right—without damaging your vehicle or affecting mileage.

Visit the Tyre Upsize Calculator page on Tyre N Tyres' website to get instant tyre size suggestions from anywhere, including Anna Salai, Chennai. It's a free tool designed for car and bike owners to explore upsizing options without guesswork.

Yes, at Tyre N Tyres, we provide professional assistance with tyre upsizing for both cars and bikes. Our experts use the Tyre Upsize Calculator, along with the Car Tyre Size Chart and Bike Tyre Size Chart, to recommend safe and compatible upsizing options. We help you select the right tyre size for better performance, mileage, and comfort.

The Tyre Upsize Calculator from Tyre N Tyres helps you safely explore tyre upgrades. By entering your current tyre size, the tool shows alternative sizes along with their percentage variation in diameter, width, and height. It ensures that your new tyres stay within safe limits—essential for maintaining speedometer accuracy, handling, and fuel efficiency. Whether you're using the Car Tyre Upsize Calculator or the Bike Tyre Sizes Calculator, it's the smart way to upsize without guesswork.

You can access the Tyre Upsize Calculator, Car Tyre Size Chart, and Bike Tyre Sizes Calculator directly on the Tyre N Tyres website. This online tool lets you compare your current tyre size with compatible upsizes instantly. Whether you're in Chennai or anywhere else, it's available 24/7 to help you make informed tyre decisions.

Choosing Tyre N Tyres means getting access to one of the most precise Tyres Calculators in Anna Salai. Our tool uses real-time data and size charts to recommend safe upsizing options for your vehicle. Whether you're using the Car Tyre Upsize Calculator or the Bike Tyre Sizes Calculator, you get accurate results backed by expert guidance.