The Wheel & Tire Calculator
Will those wheels fit?
Use our tool to check if your new 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 size
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 size
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
PCD (optional)
PCD (Pitch Circle Diameter) refers to the diameter of the bolt circle on your wheel.
It is measured as the diameter (in millimeters) of the circle passing through the center of all the lug holes.
The first number represents the number of bolts, the second number is the PCD diameter. For example, 5x114.3 means 5 bolt holes with a 114.3mm pitch circle diameter.
Note: Selecting a PCD does not affect your wheel size calculations
Wheel size
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 size
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
PCD (optional)
PCD (Pitch Circle Diameter) refers to the diameter of the bolt circle on your wheel.
It is measured as the diameter (in millimeters) of the circle passing through the center of all the lug holes.
The first number represents the number of bolts, the second number is the PCD diameter. For example, 5x114.3 means 5 bolt holes with a 114.3mm pitch circle diameter.
Note: Selecting a PCD does not affect your wheel size calculations
*The strut in diagram is only there for illustrative purposes, real distances will differ so make sure to measure.
Wheel 2 vs Wheel 1 Comparison
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Results matched to Wheel 2
Wheels
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Tires
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