Wheel spacers can be made from different materials, including aluminum, steel, and composite materials. Aluminum is a popular choice as it is lightweight and durable, but not as durable as steel which sadly tends to be heavier. So, if you want the most durable and longest-lasting setup, you are better off with steel.
It's important to choose wheel spacers that are the correct size and thickness for your vehicle. This includes the bolt pattern, center bore, and thickness of the spacer. If you plan on driving your Bronco Sport through challenging off-road trails with lots of chassis articulation and uneven roads, go for a thick spacer as light-duty ones are only suited for on-road use.
Choose wheel spacers that are made from high-quality materials and are precision-engineered for strength and durability. Look for spacers that have been tested and certified by a reputable third-party organization. Lastly, as wheel spacers essentially move the wheels further away from the car, you must go for safe options only.
It's important to ensure that the wheel spacers are installed correctly to avoid any safety issues. Make sure to follow the manufacturer's instructions carefully, and consider having a professional mechanic install them for you.
It's also worth noting that some wheel spacers can cause the wheels to protrude beyond the fender line, which can result in the vehicle being considered illegal for street use in some jurisdictions. It's important to check your local laws and regulations before installing wheel spacers on your vehicle.