Wolf Tooth won´t try to convince you that elliptical (or oval, the same thing) chainrings will change your life..but they might! What the engineers of Wolf Tooth can say for sure is that their Powertrac rings have a different feel from round rings and can provide an efficiency benefit and smoother power output for some riders.Testers report the biggest benefits on punchy singletrack and hills, allowing less shifting and faster acceleration.Wolf Tooth RFC Elliptical Chainrings fit Race Face Cinch type cranks such as Turbine, Next SL and Sixc.Wolf Tooth RFC chainrings feature a their patent pending Drop-Stop asymmetrical tooth design for the best wear life, chain retention and mud clearance.These Wolf Tooth chainrings allow a 52mm chainline for 148 Boost rear dropout.Use a 10, 11 or 12 speed chain.If using a 9 speed drivetrain, plan to use a 10 speed chain (it will shift great), as the 9 speed chain fits too loosely on the ring.Features:Compatibility:1x10 / 1x11 / 1x12 speed Race Face Cinch elliptical such as Turbine, Next SL and Sixc.BCD:without, Direct Mount, Spiderless.Material:AL-7075T6 CNC.Chainline:52mm .Application:1x10 1x11 1x12