RaceFace Turbine 9 Speed Chainring TruvativYou may not be aware but not all rings are created equal. Each manufacturer utilizes slightly different orientations and spacing between their rings and even sometimes between crank models. Therefore direct compatibility has not existed until now. The Turbine technology has been designed to work interchangeably with your Truvativ rings on your Truvativ cranks. Swap any Turbine T ring in place of your existing Truvativ ring or for unparalleled performance replace them as a complete set. The Turbine rings are made in Canada from 7075 aluminum, so they are built to last.