Shimano Dura-Ace Track Chainring
The Dura-Ace track chainring is generally considered the roundest track chainring with the tightest tolerances. No big surprise here seeing that Shimano has been making some of the finest chainrings available on the market for decades. The heat treatment and anodization they receive at the Shimano factory make them very durable and strong. Standard 144 BCD with 1/8" pitch.