1.5 Inch Wheel Spacer Adapter | 6x120 to 6x139.7 Conversion | Hub Centric 66.9mm to 78.1mm |

The 1.5 Inch Wheel Spacer Adapter is designed to allow vehicles with a 6x120 bolt pattern to use aftermarket wheels with a 6x139.7 (6x5.5) bolt pattern. Measuring 1.5 inches thick, this adapter provides both a bolt-pattern conversion and additional wheel spacing, making it a practical solution for owners who want to install a wider selection of aftermarket truck wheels while creating a more aggressive stance.

One of the most important features of this adapter is its hub-centric design, which uses a 66.9mm vehicle-side bore and a 78.1mm wheel-side bore. The 66.9mm inner bore is designed to properly locate the adapter on compatible 6x120 hubs, while the 78.1mm outer bore accommodates compatible 6x139.7 wheels. This hub-to-wheel centering helps provide proper alignment during installation and can help minimize vibration when the components are correctly matched.

The adapter changes the vehicle's original 6x120 bolt pattern to 6x139.7, allowing compatible 6-lug wheels from the larger 6x5.5 pattern to be installed. This makes the adapter particularly useful for applications where the vehicle's original wheel selection is limited but the owner wants access to a much broader range of aftermarket truck and SUV wheels. The adapter uses 14x1.5 studs in configurations designed for the compatible GM applications.

The 1.5-inch thickness also significantly changes the wheel's position. Each wheel is moved approximately 1.5 inches outward from the original mounting surface, which can increase overall track width by approximately 3 inches per axle when used on both sides. This produces a noticeably wider and more aggressive stance while potentially creating additional clearance between the wheel and certain suspension components. However, the increased spacing also means that tire clearance at the fender and wheel well should be carefully checked before installation.

Overall, the 1.5 Inch 6x120 to 6x139.7 Wheel Spacer Adapter provides a combination of bolt-pattern conversion, hub-centric fitment, and increased wheel spacing. With its 6x120-to-6x139.7 conversion, 66.9mm-to-78.1mm hub dimensions, 1.5-inch thickness, and 14x1.5 hardware, it gives compatible vehicle owners the ability to run a wider range of aftermarket wheels while achieving a significantly wider and more aggressive appearance.