Wheel and Tyre Size Calculator

Calculate and compare dimensions of wheels and tyres, to make sure they're a good fit. Our calculator can tell you how a new tyre would effect your ride height, if a larger wheel would fit in your wheel arches, and so on.

You can also compare wheels and tyres, by entering a second set of wheel and tyre information. This is so you can compare the effect of a differently sized tyre, how an offset change would effect the stance of your vehicle, and make sure a new wheel won't interfere with your brakes.

We sell a huge range of alloy wheels, each available with tyres which can be installed and delivered to you, or fitted at one of our many fitting centres.

If you need to measure your wheel or hub's PCD, which is important when fitting aftermarket wheels or spacers, you might find our PCD Calculator useful.

If you're stuck and need help or advice, you can read our alloy wheel buying guide, or feel free to get in touch.

Current Wheel and Tyre


New Wheel and Tyre



  Current New Difference
Overall Diameter      
Overall Circumference      
Inner Rim Position (Inset)      
Outer Rim Position (Poke)      
Speedo Reading at 30mph      
Speedo Reading at 60mph      

Click here to view our range of alloy wheels