DURA-ACE Track features race-proven Hollowtech Octalink Bottom Brackets. This is an NJS approved bottom bracket, with sealed bearings.
• JIS (English BSC) Thread
• BB Shell Width: 68mm
• Spindle Length: 109.5mm
• Spindle Material: Chrome-moly Steel
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.