Welcome to Rota Wheels UK - the home of Rota Wheels in Europe

Tyre Size Calculator

Enter your existing wheel and tyre specification in 'Existing Setup' then enter the specification of your potentially new wheels and tyres to see what a difference it will make!

This tool is great for working out if your new wheels will give you more or less clearance to your suspension and wheel arches. If you have any questions or need help using it please do get in touch and we'll be happy to help you with it.

Existing setup

New setup

Tyre diagram

The image to the left shows your 'Existing' wheel and tyre (grey + black) with the 'New Setup' (green + black) overlaid.

This is a graphical representation of how your chosen change in wheel and tyre will affect your stance, poke and clearance.

To see the wheel to tyre ratio changes, and the Existing vs New tyres in profile select 'Tyre Image'.

For the measurements, take a look in the 'Data Table' tab.

Tyre image
Data table
ExistingNew
Tyre Diameter631.9mm625.3mm
Tyre Circumference1985.2mm1964.4mm
Additional PokeN/A
Inboard ClearanceN/A
Gearing ChangeN/A1.01%
Speedo at 30mph30mph
Speedo at 60mph60mph
Ride Height ChangeN/A
Arch Gap ChangeN/A

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  1. D154 18x8.5 5x108 ET42 Gunmetal
    Excl. VAT: £212.50 Incl. VAT: £255.00
    The perfect fitting wheel for: Focus RS MK2 Focus RS MK2.5 Focus RS MK3 Focus ST2 Focus ST2.5 Focus ST3 Volvo C30 Learn More
  2. D154 18x8.5 5x108 ET42 Silver
    Excl. VAT: £212.50 Incl. VAT: £255.00
    The perfect fitting wheel for: Focus RS MK2 Focus RS MK2.5 Focus RS MK3 Focus ST2 Focus ST2.5 Focus ST3 Volvo C30 Learn More
  3. D154 18x8.5 5x108 ET42 White
    Excl. VAT: £212.50 Incl. VAT: £255.00
    The perfect fitting wheel for: Focus RS MK2 Focus RS MK2.5 Focus RS MK3 Focus ST2 Focus ST2.5 Focus ST3 Volvo C30 Learn More
  4. Force 18x8.5 5x108 ET42 Gloss Black
    Excl. VAT: £212.50 Incl. VAT: £255.00
    Force,18,8.5,5108,ET42,Gloss Black The perfect fitting wheel for any Ford Focus ST / RS Learn More
  5. Force 18x8.5 5x108 ET42 Hyper Black
    Excl. VAT: £212.50 Incl. VAT: £255.00
    Force,18,8.5,5108,ET42,Hyper Black The perfect fitting wheel for any Ford Focus ST / RS Learn More
  6. Force 18x8.5 5x108 ET42 White
    Excl. VAT: £212.50 Incl. VAT: £255.00
    Force,18,8.5,5108,ET42,White The perfect fitting wheel for any Ford Focus ST / RS Learn More
  7. Grid 18x8.5 5x108 ET42 Flat Black 2
    Excl. VAT: £212.50 Incl. VAT: £255.00
    Grid,18,8.5,5108,ET42,Flat Black 2 The perfect wheel for your Ford Focus RS / ST Learn More
  8. Grid 18x8.5 5x108 ET42 Steelgrey
    Excl. VAT: £212.50 Incl. VAT: £255.00
    The perfect fitting wheel for: Focus RS MK2 Focus RS MK2.5 Focus RS MK3 Focus ST2 Focus ST2.5 Focus ST3 Volvo C30 Learn More
  9. Grid 18x8.5 5x108 ET42 White
    Excl. VAT: £212.50 Incl. VAT: £255.00
    The perfect fitting wheel for: Focus RS MK2 Focus RS MK2.5 Focus RS MK3 Focus ST2 Focus ST2.5 Focus ST3 Volvo C30 Learn More
  10. LC818 19x8.5 5x108 ET42 Gunmetal
    Excl. VAT: £183.33 Incl. VAT: £220.00
    The perfect fitting wheel for: Focus RS MK2 Focus RS MK2.5 Focus RS MK3 Focus ST2 Focus ST2.5 Focus ST3 Volvo C30 Learn More

Grid List

Set Descending Direction

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