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Generic · Threaded bottom bracket
A threaded 73 mm BSA bottom bracket for OCTALINK cranksets.
$34.99
PriceIn stock, ready to ship
This is a practical replacement bottom bracket for bikes using an OCTALINK crank interface and a 73 mm BSA shell. Check both your shell width and required axle length before ordering: this version uses a 126 mm axle.
Sold by Ashburton Cycles
Verified store
Price
$34.99
Axle length
126 mm
Bottom bracket shell
73 mm (BC1.37 / BSA)
Spindle interface
OCTALINK
The BB-ES300 is a threaded bottom bracket for frames with a 73 mm BC1.37 / BSA shell. Its 126 mm steel hollow-pipe axle is made for cranksets using the OCTALINK splined interface, so it is a direct replacement option when your existing crankset uses this standard.
The OCTALINK connection uses eight splines to join the crankset and spindle, providing a dedicated interface intended to improve the strength and rigidity of the complete assembly compared with a conventional square-taper arrangement. The hollow spindle is designed to balance stiffness with lower axle weight, while the steel right-hand adapter/shell has a phosphate-coated finish.
Before buying, confirm that your frame has a 73 mm threaded BSA shell, your crankset is OCTALINK-compatible, and your existing setup calls for a 126 mm axle. OCTALINK is an older, discontinued interface, so replacement availability can become less predictable than with more current bottom-bracket standards; if changing to a different bottom-bracket type, you will also need a compatible crankset.
A suitable choice for restoring or maintaining a touring, hybrid or mountain bike that already uses a 73 mm BSA shell, OCTALINK crankset and 126 mm axle requirement.
73 mm BSA threading
Designed for frames with a 73 mm BC1.37 / BSA threaded bottom-bracket shell.
OCTALINK crank interface
The eight-spline connection is made specifically for OCTALINK cranksets rather than square-taper cranks.
126 mm axle length
Provides the axle dimension needed for compatible crankset and frame setups.
Hollow steel spindle
The hollow-pipe construction is designed to deliver a stiff, lightweight axle assembly.
Durable right-hand shell
The steel right-hand adapter/shell has a phosphate-coated finish.
Resin left-hand adapter
The left-hand adapter uses a resin construction as part of the cartridge assembly.
Threaded cartridge design
A practical enclosed replacement format for compatible service or refurbishment work.
Every detail as listed by the manufacturer.
Generic is a catalogue designation for products presented without a distinct store-brand identity. The term describes the retail classification rather than a separate manufacturer history or geographic origin. Generic-labelled products can still have clearly defined specifications, standards and compatibility requirements. For this component, the catalogue designation is retained while the fitment details identify the relevant road bottom bracket application.
Generic · Threaded bottom bracket
A threaded 73 mm BSA bottom bracket for OCTALINK cranksets.
$34.99
In stockAxle length
126 mm
Bottom bracket shell
73 mm (BC1.37 / BSA)
Spindle interface
OCTALINK
Spindle construction
Hollow pipe
This is a practical replacement bottom bracket for bikes using an OCTALINK crank interface and a 73 mm BSA shell. Check both your shell width and required axle length before ordering: this version uses a 126 mm axle.
The BB-ES300 is a threaded bottom bracket for frames with a 73 mm BC1.37 / BSA shell. Its 126 mm steel hollow-pipe axle is made for cranksets using the OCTALINK splined interface, so it is a direct replacement option when your existing crankset uses this standard.
The OCTALINK connection uses eight splines to join the crankset and spindle, providing a dedicated interface intended to improve the strength and rigidity of the complete assembly compared with a conventional square-taper arrangement. The hollow spindle is designed to balance stiffness with lower axle weight, while the steel right-hand adapter/shell has a phosphate-coated finish.
Before buying, confirm that your frame has a 73 mm threaded BSA shell, your crankset is OCTALINK-compatible, and your existing setup calls for a 126 mm axle. OCTALINK is an older, discontinued interface, so replacement availability can become less predictable than with more current bottom-bracket standards; if changing to a different bottom-bracket type, you will also need a compatible crankset.
A suitable choice for restoring or maintaining a touring, hybrid or mountain bike that already uses a 73 mm BSA shell, OCTALINK crankset and 126 mm axle requirement.
73 mm BSA threading
Designed for frames with a 73 mm BC1.37 / BSA threaded bottom-bracket shell.
OCTALINK crank interface
The eight-spline connection is made specifically for OCTALINK cranksets rather than square-taper cranks.
126 mm axle length
Provides the axle dimension needed for compatible crankset and frame setups.
Hollow steel spindle
The hollow-pipe construction is designed to deliver a stiff, lightweight axle assembly.
Durable right-hand shell
The steel right-hand adapter/shell has a phosphate-coated finish.
Resin left-hand adapter
The left-hand adapter uses a resin construction as part of the cartridge assembly.
Threaded cartridge design
A practical enclosed replacement format for compatible service or refurbishment work.