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Wheel Backspace Calculator | From Offset & Width

Calculate a wheel's backspace (in inches) based on its width (inches) and offset (mm). Essential for determining inner wheel clearance and proper fitment.

Calculate a wheel's backspace in inches based on its width and offset (mm).
About This Calculator

Wheel backspace is a critical measurement for ensuring proper wheel fitment, particularly for checking clearance with suspension components. It represents the distance from the wheel's mounting surface (hub) to its innermost lip/edge. This calculator takes the wheel's width (in inches) and its offset (in millimeters) to calculate the backspace in inches. Understanding backspace helps you determine how far the inner edge of the wheel will sit relative to its mounting surface and ensure it doesn't interfere with vehicle parts. Positive offset generally means less backspace, while negative offset means more backspace for a given wheel width.

  • Wheel Width: The overall width of the wheel, typically measured in inches from bead seat to bead seat.
  • Offset: The distance (in millimeters) from the wheel's mounting surface (hub) to its centerline. Positive offset means the mounting surface is towards the wheel's face (outer side). Negative offset means it's towards the inside (brake side). Zero offset means the mounting surface is at the exact centerline.
  • Backspace: The distance (in inches) from the wheel's mounting surface to its innermost lip/edge. It indicates how much space the wheel takes up towards the vehicle's suspension.

Understanding these measurements is crucial for ensuring proper wheel fitment, avoiding interference with suspension components or fenders, and achieving the desired stance.

How to Use This Calculator
  1. Enter the Wheel Width in inches (e.g., 8.5).
  2. Enter the Offset in millimeters (e.g., +35 or -10). Use a positive value for positive offset and a negative value for negative offset.
  3. Click the 'Calculate Backspace' button.
  4. The result will show the calculated backspace in inches.
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Disclaimer

All tools and information provided on TireCalculatorHub are for informational purposes only. Always consult with a qualified professional before making decisions about your vehicle's tires or modifications.

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