Calculating the backspace and/or offset of the wheel is important when ordering new wheels. Especially if the tyre size changes it is important to consider the correct offset.
- Offset is the distance between hub mounting face and wheel center line.
- Track width is the distance between wheel center lines.
- Negative offset increases track width, positive offset decreases it.
- BACKSPACE CALCULATION:
- Backspace (BS) is a measure from wheels machine side edge to hub mounting face
- Offset can be calculated from BS measurement
- e.g. DW18L*38 BS 200 mm
- Rim width: 457 mm
- Flange width: 21 mm
- Offset: 200 – (457/2 + 21) = -50 mm
Here’s a snip from our Wheel training video of the backspace calculation:
