Offset/ET:
It is a measurement of how far the mounting face of the wheel (on the brake side) is away from the center line of the wheel. If the mounting face lines up exactly with the center line it is called “Zero Offset”, if the mounting face is further out towards the show side of the wheel, this is called “Positive Offset”, and if it is further inside the wheel (towards the brakes) then this is called “Negative Offset” (this is much rarer). There are two common ways to measure this though they both provide a different number:
