Best current price£100.15from eBay
Shopping.co.uk recommended and popular offers
eBay£100.15Visit shop Shimano Dura-Ace Octalink Bottom Bracket 7700 BS 68 x 109.5mm Threaded Bike BB
Visit shop1 offer from £100.15
View price history by clicking the chart icon.
The Shimano Dura-Ace BB-7700 is a high-performance bottom bracket specifically designed for serious cyclists and restorers utilizing the road Octalink splined interface. It provides exceptional stiffness and power transfer through its unique splined spindle design, making it an ideal choice for high-intensity road riding; however, its reliance on a proprietary axle standard means it is only compatible with specific Octalink cranksets and cannot be used with modern external bearing or square-taper systems.
| Model Part Number | BB-7700 |
|---|---|
| Brand | Shimano |
No, this is an Octalink-specific bottom bracket and will not fit square-taper cranksets.
No, the BB-7700 is designed for V1 Octalink. V2 splines are deeper and incompatible.
The unit has an average weight of 173 grams.
No, it features a sealed cartridge design, so it is maintenance-free.
You need a standard Shimano-style splined bottom bracket tool.
The axle uses a 22 mm diameter hollow chrome-moly pipe billet.
Remove the bottom bracket, clean the threads on the frame and the unit, apply fresh marine-grade grease, and reinstall to the recommended torque specification.
Ensure the crank splines are clean and verify you are using a V1 Octalink crankset, as V2 Octalink splines are physically incompatible.
Check that the locking rings are fully tightened; if play persists, the internal cartridge bearings may be worn and the unit will require replacement.
Installation of the BB-7700 requires a specific bottom bracket tool compatible with the Shimano internal spline pattern. When installing, ensure the bottom bracket shell is clean and properly greased to prevent seizing. This unit is designed exclusively for Octalink V1 cranksets; verify your crank arm compatibility before attempting installation. Because the internal bearings are sealed, they do not require manual lubrication or servicing. Periodically check the unit for any lateral play, and keep the shell area clean to prevent grit from entering the interface.
