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Just another way to express where the hub is positioned in the wheel. 3 1/2 backspacing means that's the distance from the back of the hub to the inside edge of the wheel, which means on a 10 inch wheel, the other 6 1/2 is to the outside edge, and the offset is (half of 6 1/2 less 3 1/2) one and a half inches.
Very important if you're putting wider wheels on your truck - need to keep the backspacing pretty close to the stock wheel backspacing, or things start to rub.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.