This is a very popular bottom bracket back in the late 1980s to early 1990s.

Specifications:
• BSA Cups
• ISO Tapered
• 109mm Spindle Length
• NJS Stamped

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.