What is the 2008 Chevy truck backspace with 18 wheels?

There's no single answer to the backspacing for a 2008 Chevy truck with 18" wheels. Backspacing is the distance from the mounting surface of the wheel to the innermost part of the wheel. It depends entirely on the specific wheel and tire combination chosen for the truck. Different wheels, even with the same diameter, will have different backspacings.

To find the correct backspacing for your 2008 Chevy truck with 18" wheels, you need to:

1. Determine your truck's model: (e.g., Silverado 1500, Silverado 2500HD, Silverado 3500HD, Colorado, etc.) Different models have different wheel well dimensions.

2. Identify your desired wheel width: Wider wheels require different backspacing than narrower ones to fit properly and avoid rubbing.

3. Choose your tires: Tire size (height and width) impacts the overall fitment.

4. Consult a wheel and tire fitment guide: Many online resources and automotive parts stores offer fitment guides specific to vehicle year, make, and model. These guides will often suggest appropriate backspacing ranges.

5. Consider aftermarket wheel options: If you are using aftermarket wheels, the manufacturer's specifications will state the backspacing.

Without knowing the specifics of your wheel and tire setup, it's impossible to give you a backspacing measurement. Incorrect backspacing can lead to rubbing against suspension components or the body, potentially causing damage.