absoluteBLACK Oval 110 BCD CX Chainring – 40t 110 Shimano Asymmetric BCD 4-Bolt Narrow-Wide Black. absoluteBLACK Oval 110 BCD 1x Chainrings for Cyclocross are designed for all Shimano 4-bolt cranks such as Dura-Ace 9100 9000 Ultegra 8000 6800 and more. The specially designed narrow-wide tooth profile keeps the chain snug allowing you to leave your chain keeper in the garage. They are crafted from CNC machined 7075 aluminum and feature an anodized finish for exceptional durability. Ovality has been optimized for each chainring size ranging from 10.5 – 11.4% with timing of 112 – 113 after TDC (top dead center).

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