CenTor is the acronym for Centering and Torque. These two factors are what make this type of adapter so superior as a wheel balancing tool. CenTor adaptors are ideal for old, worn and abused wheels as well as new perfect wheels CenTor adaptors will balance any steel or aluminum wheel to within a couple of grams of what is theoretically possible with that specific wheel balancer and wheel. In other words, a CenTor adaptor optimizes any wheel balancer so it can balance as accurately as it was engineered to do.