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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. Formula 18x8.0 5x100 ET44 Steel Grey

    Formula 18x8.0 5x100 ET44 Steel Grey

    Excl. VAT: £191.67 Incl. VAT: £230.00

    Formula,18x8.0,5x100,ET44,Steel Grey Learn More
  2. Formula 18x8.0 5x112 ET44 Steel Grey

    Formula 18x8.0 5x112 ET44 Steel Grey

    Excl. VAT: £191.67 Incl. VAT: £230.00

    Formula,18x8.0,5x112,ET44,Steel Grey Learn More
  3. Formula 18x8.0 5x114 ET44 Steel Grey

    Formula 18x8.0 5x114 ET44 Steel Grey

    Excl. VAT: £191.67 Incl. VAT: £230.00

    Formula,18x8.0,5x114,ET44,Steel Grey Learn More
  4. Gra 17x7.5 5x100 ET48 Steelgrey

    Gra 17x7.5 5x100 ET48 Steelgrey

    Excl. VAT: £150.00 Incl. VAT: £180.00

    Gra,17,7.5,5100,ET48,Steelgrey Learn More
  5. Gra 18x7.5 5x100 ET48 Steelgrey

    Gra 18x7.5 5x100 ET48 Steelgrey

    Excl. VAT: £166.67 Incl. VAT: £200.00

    Gra,18,7.5,5100,ET48,Steelgrey Learn More
  6. Grid 17x7.5 4x100 ET45 Steel Grey

    Grid 17x7.5 4x100 ET45 Steel Grey

    Excl. VAT: £150.00 Incl. VAT: £180.00

    Grid,17,7.5,4100,ET45,Steel Grey Learn More
  7. Grid 2 17x7.5 4x108 ET25 Steelgrey

    Grid 2 17x7.5 4x108 ET25 Steelgrey

    Excl. VAT: £150.00 Incl. VAT: £180.00

    Grid2,17,7.5,4108,ET25,Steelgrey Learn More
  8. Recce 17x7.5 4x108 ET25 Steelgrey

    Recce 17x7.5 4x108 ET25 Steelgrey

    Excl. VAT: £150.00 Incl. VAT: £180.00

    Recce,17,7.5,4108,ET25,Steelgrey Learn More
  9. Recce 17x8 4x108 ET40 Steelgrey

    Recce 17x8 4x108 ET40 Steelgrey

    Excl. VAT: £158.33 Incl. VAT: £190.00

    The perfect fitting wheel for: Ford Fiesta MKV Ford Fiesta MKVI Ford Fiesta MKVII Learn More
  10. RKR 15x8 4x100 ET0 Steelgrey

    RKR 15x8 4x100 ET0 Steelgrey

    Excl. VAT: £141.67 Incl. VAT: £170.00

    Serious fitment wheels for the following vehicles - Arch work may be needed! Honda Civic Mazda MX5 Mk1 (NA) Mazda MX5 Mk2 (NB) Mazda MX5 Mk2.5 (NB) Suzuki Swift Toyota Starlet Vauxhall Corsa Learn More

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