Use our tool to check if your new alloy wheels and tires will fit your vehicle. Enter the wheel and tire sizes to find the perfect fitment and avoid fitment issues such as poke, inset and rubbing. We'll even calculate potential speedo error. Try it now and find your perfect fitment.

cm mm | ||
---|---|---|

Diameter | ||

Circumference | ||

Poke | ||

Inset | ||

Speedo Error | ||

Speedo Reading at 30mph | ||

Speedo reading at 60mph | ||

Ride height change | ||

Arch gap change | ||

Tire fitment | ||

Tire Size | 205/45R17 | 225/40R18 |

Wheel Size | 17 x 7 ET48 | 18 x 8 ET35 |

Select for Analysis |

Wheel 117 x 7 ET48 205/45R17

**Wheel diameter** value is in **Inches**, it is the diameter of the wheel without the tire.

**Wheel width** value is in **Inches**, it is the width of the section between the mounting flanges on the wheel.

**Offset** has an ET (Einpress Tiefe) value in **millimetres (mm)** which indicates the distance between the mounting surface and the geometric centre of the wheel.

Often displayed as:

17 x 7 ET48

**Tire width** value is in **millimetres (mm)**, it is the first value when reading tire size.

**Tire Profile** value is a **percentage** of the wheel diameter, typically between 35 and 55 it is the height of the tire sidewall.

Often displayed as:

205/45R17

Wheel 218 x 8 ET35 225/40R18

**Wheel diameter** value is in **Inches**, it is the diameter of the wheel without the tire.

**Wheel width** value is in **Inches**, it is the width of the section between the mounting flanges on the wheel.

**Offset** has an ET (Einpress Tiefe) value in **millimetres (mm)** which indicates the distance between the mounting surface and the geometric centre of the wheel.

Often displayed as:

18 x 8 ET35

**Tire width** value is in **millimetres (mm)**, it is the first value when reading tire size.

**Tire Profile** value is a **percentage** of the wheel diameter, typically between 35 and 55 it is the height of the tire sidewall.

Often displayed as:

225/40R18

17 x 7 ET48 205/45R17

18 x 8 ET35 225/40R18

*The strut in diagram is only there for illustrative purposes, real distances will differ so make sure to measure.