Race face race rings 9 speed inner chainringour race rings have been designed for optimal performance featuring the race face patented shif t technology we have optimized shifting performance by maximizing the chain to ring surface contact areas the race rings have been machine sculpted for maximum weight savings features cnc machined from 7075 t6 one of the strongest alloys available today outer rings are made from 4mm thick material inner ring from 5mm thick material for unsurpasse