Shimano Dura-Ace BSA Track Bottom Bracket

The Dura-Ace bottom brackets are the fastest and smoothest in the Shimnano Octolink Bottom Bracket line-up, designed for the Track racer in mind.

There are two different versions of the Dura Ace Bottom Bracket, with different pros and cons depending on how you wish to use it.

BB-7710 (Sealed)

- Sealed Bearings
- Suitable for people riding in all weather conditions
- Little to no maintenance required
- Cannot be serviced
- Weight: 244g

BB-7700 (unsealed)

- Unsealed bearings
- Suitable for Indoor track racing (and out-door in fair weather)
- Requires yearly maintenance
- Requires pre-load adjustment for correct setup – We recommend a skilled mechanic
- Fast Rolling
- Can be re-built and overhauled by a skilled mechanic
- Weight: 173g

Specifications:

- Bottom bracket: BSA Threaded (1.37" x 24tpi)
- Shell width: 68-69mm
- Axle length: 109.5mm
- Axle type: Steel
- Spindle system: Octalink
- Suits: FC-7710 Dura-Ace Track Cranks only