The Cartek Group Ze-Ru System is a patent-pending zero runout wheel connection technology for wheel alignment on medium and heavy duty vehicles. The Ze-Ru clamping mechanism rests on a precise surface provided by the flat area of the rim, helping to eliminate play, deflection and movement, to eliminate the need for "runout" detection and make the wheel alignment process more efficient. This system is suitable for a variety of Class 5, 6, 7 and 8 vehicles using different size adapters. This system allows users to obtain wheel alignment ratings in a few minutes, the company says.