Wheel Offset Calculator
Thinking about wider wheels or a different offset? Enter your current and new wheel specs to see exactly how the fitment changes. The calculator shows backspacing, inner and outer clearance shifts, and warns you about potential rubbing issues.
Key terms:
- Offset (ET) -- the distance in millimeters from the wheel's centerline to its mounting face. Positive offset means the mounting face is toward the street side (most modern cars). Zero or negative offset pushes the wheel outward.
- Backspacing -- the distance from the mounting face to the inner edge of the wheel. Backspacing = (wheel width / 2) + offset.
- Track width -- the total distance between the outer edges of the left and right wheels. Wider track = more stability but potential fender clearance issues.
Common offset ranges:
- Front-wheel drive cars: +35 to +50 mm
- Rear-wheel drive cars: +15 to +35 mm
- Trucks and SUVs: 0 to +25 mm
- Deep-dish / aggressive stance: -10 to +10 mm
Safety note: Going more than 5-10 mm from your factory offset can affect handling, bearing wear, and steering feel. Always verify physical clearance before mounting new wheels.