Race Face Turbine 2X10 80 BCD Chainring: After two years of engineering work & rigorous testing, the all new Turbine rings are ready to ride. Completely redesigned from the ground up, these rings shift like nothing else. As with our previous Team & Race rings, the Turbine rings are made in Canada from 7075 aluminum, so they are built to last. New asymmetrical tooth profiling & more upshift & downshift zones yield instantaneous smooth & quiet shifting, even under load. Three times stiffer than our previous Team chainrings without any weight gain. Net result is much sharper, quicker & more responsive shifts as well as increased resistance to impacts. Asymmetrical tooth profiling with more shift zones Super stiff with sharper, quicker shifts 80 BCD 10 Spd Built for XC