Put simply, they're the mechanisms that rotate on the axles of your Mercedes-Benz vehicle. They build the mechanical leverage, multiply the force, and create the motive power to spin its tires. There's much more to them, though. Here are the basics.For one, they're made of one of several high-strength metals -- usually, steel or aluminum alloy. They can also be made of ultra-resilient polymers like carbon fiber.Available sizes, measured in diameters, range from around 15 inches to 20 inches or more. For example, one of the most popular sizes for Mercedes-AMG wheels is 18 inches.Several factors determine wheel style -- the number of spokes, whether they're single-spoke, twin- spoke, or multi-spoke, and the climate and/or weather that they're made for, for instance.As for available colors, OEM and aftermarket brand alike can offer far too many choices to name. Generally, though, wheels for Mercedes-Benz vehicles are usually color-matched to the make's specific models.