BDS Suspension Coilover Spanner Wrench
The BDS spanner wrench for BDS Fox 2.5 Coil-overs features a unique design that uses a 1/2" ratchet or 1/2" breaker bar as the handle. Using a ratchet allows the spanner wrench to function in multiple positions making it much easier to use in tight IFS suspension setups. The spanner wrench is a pin-style design that is precision machined to fit in the Fox adjustment collar holes. This precise fit provides the best grip and reduces the chance of damage to the tool, adjustment collar and your knuckles. The tool was designed for ease of use and includes user instructions.
Wheel Backspacing & Offset Calculator
Convert wheel backspacing in inches to offset in millimetres, or the other way around. Find the right measurements for your wheel setup.
Backspace to Offset Calculator
Enter wheel width and backspace (inches). Offset can be positive or negative.
- Backspace
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- Frontspace
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- Offset type
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Enter a valid wheel width and measurement to view the diagram.
BDS wheel positioning guidance
Meeting a backspacing limit does not guarantee wheel fitment. Check wheel diameter, tyre size, brake clearance, suspension and all kit-specific requirements.
Results are approximate. The calculation allows an additional 1 inch for the wheel's two rim flanges (approximately 0.5 inch each). Actual flange dimensions vary between wheels.
Understanding wheel measurements
What is wheel backspacing?
The distance from the wheel mounting surface to the outermost edge of the inner rim flange, measured in inches.
What is wheel offset?
The distance between the wheel mounting surface and the wheel centreline, measured in millimetres.
Why does wheel width matter?
Two wheels with the same backspacing but different widths will have different offsets.
Why does BDS specify backspacing?
It helps position the wheel relative to steering and suspension parts, but is only one part of confirming fitment.
