The Shimano Zen Track chainring was used by those whom participated in UCI World Championships or the Olympic Games. Those used are the 1/8 pitch and are non retail products.
This 53T Shimano Zen is a used product with lots of life left. The Shimano Zen Chainring has been discontinued in production.
• 1/2 X 1/8"
Dura Ace has represented the state of art of bicycle components under Shimano since 1973. Over the past 40 years, Dura Ace has tested and developed many excellent components that delivers concentration, control and confidence with slick, fast, accurate performance.