absoluteBLACK Premium Oval 110 BCD Road Chainrings utilize absoluteBLACK's top-tier design features to greatly improve traction and speed. They are for use with all pre-2014 Shimano 5-bolt cranks, such as Dura-Ace FC7950, Ultegra FC6750, Shimano 105 5750 and more. Optimized with smooth shifting in mind, premium chainrings have a 6-point ramp and recess design. Chainrings are crafted from CNC machined 7075 aluminum, and feature an anodized finish for exceptional durability.If only switching the inner chainring to oval, use all original crank bolts6.5% ovality is ideal for road climbing30gOval shape reduces stress on knees, helps to keep your legs fresh, and does not feel any different while ridingChainring design reduces the possibility of leg cramps, and allows you to maintain a better cadence while climbingUse with absoluteBLACK long chainring bolts34T Oval chainring has an ovality of 32/36T and is best for someone who uses currently 33 or 34T round ring.Item SpecificationsChainring BCD110ColorBlackDefined ColorBlackDrivetrain Speeds10Drivetrain Speeds11MaterialAluminumRing Position/TypeInnerTooth Count34