Here's an explanation of what backspace and offset mean. Backspace is the distance from a wheel's mounting surface to the back edge of the wheel in inches. By "back" we mean the brake side of the ...

Actually no, that's only a part of the equation. The other part is backspacing and offset, and if they're wrong, chances are you won't be rollin'. 0:00 / 0:00 ...

Negative offset would be the opposite, with an 8-inch-wide rim with a negative 1.5 offset resulting in 2.5 inches of backspacing and 5.5 inches of stickout for a much wider stance.

Offset is typically measured in millimeters. Backspace is the distance from the hub face to the back outer edge of the rim (not the tire bead) and is expressed in inches.

Often, we hear the terms "backspacing" and "offset" used interchangeably as applied to road-wheel dimensions. They are in fact not the same, but you can derive one from the other.