BMW Motorsport specializes in more than engines and transmissions, and the 2006 M6 gets a full suspension, steering, and brake system massage, not to mention tweaked technology calibrated to extract every ounce of performance from the car. Starting our discussion where the rubber meets the road, the 2006 BMW M6 rides on 19-inch M Double Spoke wheels shod with Z-rated performance tires. Designed specifically for use on the M5 and new M6, these P255/40ZR19 front and P285/35ZR19 rear tires are not run-flats, and there is no spare. Rather, because BMW claims that no run-flat tire technology exists that meets its standards for performance, the M6 is equipped with an M Mobility System that includes sealant and an inflator kit to help get the car to the closest BMW dealer. If you really don’t want to bother, 24-hour roadside assistance is standard for the duration of the basic warranty, and available for the life of the M6.