Wheel Offset Calculator
Calculate clearance and position changes when upgrading wheels
Compare Wheel Offsets
Current Wheel
Declared width of the current wheel
Distance from centerline to mounting surface
New Wheel
Declared width of the new wheel
Distance from centerline to mounting surface
Offset Calculation Results
Wheel Specifications
Offset Types
Clearance Impact Analysis
Less clearance from fender
Less clearance from suspension
⚠️ Important Considerations
- • Large change in fender clearance - check for interference
- • Test fit wheels and check all clearances before final installation
Example Calculation
Understanding Wheel Offset
Positive Offset
Mounting surface closer to outside edge
Zero Offset
Mounting surface at centerline
Negative Offset
Mounting surface closer to inside edge
Key Terms
Wheel Width
Distance between bead seats where tire sits
Offset
Distance from centerline to mounting surface
Backspacing
Distance from mounting surface to inner edge
Centerline
Imaginary line dividing wheel into equal halves
Understanding Wheel Offset Calculations
What is Wheel Offset?
Wheel offset is the distance between the wheel's centerline and its mounting surface. It determines how far in or out the wheel sits relative to the vehicle's suspension and body panels.
Calculation Formulas
Clearance = (W₁ - W₂)/2 + (O₁ - O₂)
Position = (W₁ - W₂)/2 - (O₁ - O₂)
Where W = width, O = offset, subscript 1 = current, 2 = new
Why Offset Matters
- •Clearance: Prevents interference with suspension components
- •Fender Gap: Affects wheel position relative to body panels
- •Handling: Changes scrub radius and steering feel
- •Bearing Load: Affects stress on wheel bearings
Safety Note
Always verify physical clearances before final installation. Computer calculations should be confirmed with test fitting to ensure safe operation.