Today's high-performance SUVs and trucks may need high offset brake clearance if the suspension has been upgraded, or if sway bar links are installed. Backspacing is the distance from the hub to the inside lip of the wheel. If backspacing is high, the tire may rub against the interior components. Increasing the offset creates more space between the inner lip and parts. Understanding how the two numbers work together can help you customize your rig's performance and appearance.