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Generic · OCTALINK bottom bracket
A stiff, serviceable OCTALINK bottom bracket for 73 mm BSA shells and E-type front derailleurs.
$39.99
PriceIn stock, ready to ship
This is the replacement bottom bracket to choose when your crankset uses the 8-splined OCTALINK interface and your frame has a 73 mm BSA shell. The 126 mm hollow steel spindle keeps the drivetrain rigid while the E-type configuration supports the correct front-derailleur installation.
Sold by Ashburton Cycles
Verified store
Price
$39.99
Axle length
126 mm
Shell width
73 mm
Shell standard
BSA / BC1.37
The BB-ES300-E is a dependable replacement for bikes using an OCTALINK crankset, a 73 mm BSA / BC1.37 threaded shell and an E-type front derailleur. Its 126 mm axle length is important for achieving the intended crank position and chain line, so check your existing bottom-bracket measurements and crankset requirements before ordering.
The 8-splined OCTALINK interface provides a broad, secure connection between the crank and bottom bracket, helping the assembly handle pedalling loads with good rigidity. The hollow pipe spindle keeps weight under control while maintaining a stiff drivetrain platform, and the reinforced spline interface supports accurate crank installation.
For regular MTB, touring or utility-bike servicing, this is a practical cartridge-style replacement with steel construction, a phosphate-coated right-hand shell and a resin left-hand adapter. The E-type configuration is the key fit detail: choose this version only when your drivetrain uses an E-type front derailleur. Mounting bolts are not included.
A practical choice for anyone replacing a worn OCTALINK bottom bracket on a bike with a 73 mm BSA shell, 126 mm axle requirement and E-type front derailleur.
OCTALINK crank interface
The 8-splined connection gives the crank and bottom-bracket assembly a strong, rigid interface for efficient power transfer.
126 mm axle length
A precise fit for cranksets that specify a 126 mm spindle, helping preserve the intended chain line and crank position.
73 mm BSA shell fit
Designed for frames with a 73 mm threaded BSA / BC1.37 bottom-bracket shell.
E-type configuration
Built for installations using an E-type front derailleur; confirm this requirement before purchasing.
Hollow pipe spindle
The hollow steel spindle reduces unnecessary mass while maintaining a firm platform under pedalling load.
Durable mixed construction
A steel right-hand adapter and shell combine with a resin left-hand adapter for a robust, serviceable assembly.
Chain-line control
The configuration supports accurate chain-line positioning for consistent drivetrain operation.
Installation tool compatibility
Removal is specified with the TL-UN74-S adapter tool reference; mounting bolts are not included.
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 · OCTALINK bottom bracket
A stiff, serviceable OCTALINK bottom bracket for 73 mm BSA shells and E-type front derailleurs.
$39.99
In stockAxle length
126 mm
Shell width
73 mm
Shell standard
BSA / BC1.37
Interface
8-splined OCTALINK
This is the replacement bottom bracket to choose when your crankset uses the 8-splined OCTALINK interface and your frame has a 73 mm BSA shell. The 126 mm hollow steel spindle keeps the drivetrain rigid while the E-type configuration supports the correct front-derailleur installation.
The BB-ES300-E is a dependable replacement for bikes using an OCTALINK crankset, a 73 mm BSA / BC1.37 threaded shell and an E-type front derailleur. Its 126 mm axle length is important for achieving the intended crank position and chain line, so check your existing bottom-bracket measurements and crankset requirements before ordering.
The 8-splined OCTALINK interface provides a broad, secure connection between the crank and bottom bracket, helping the assembly handle pedalling loads with good rigidity. The hollow pipe spindle keeps weight under control while maintaining a stiff drivetrain platform, and the reinforced spline interface supports accurate crank installation.
For regular MTB, touring or utility-bike servicing, this is a practical cartridge-style replacement with steel construction, a phosphate-coated right-hand shell and a resin left-hand adapter. The E-type configuration is the key fit detail: choose this version only when your drivetrain uses an E-type front derailleur. Mounting bolts are not included.
A practical choice for anyone replacing a worn OCTALINK bottom bracket on a bike with a 73 mm BSA shell, 126 mm axle requirement and E-type front derailleur.
OCTALINK crank interface
The 8-splined connection gives the crank and bottom-bracket assembly a strong, rigid interface for efficient power transfer.
126 mm axle length
A precise fit for cranksets that specify a 126 mm spindle, helping preserve the intended chain line and crank position.
73 mm BSA shell fit
Designed for frames with a 73 mm threaded BSA / BC1.37 bottom-bracket shell.
E-type configuration
Built for installations using an E-type front derailleur; confirm this requirement before purchasing.
Hollow pipe spindle
The hollow steel spindle reduces unnecessary mass while maintaining a firm platform under pedalling load.
Durable mixed construction
A steel right-hand adapter and shell combine with a resin left-hand adapter for a robust, serviceable assembly.
Chain-line control
The configuration supports accurate chain-line positioning for consistent drivetrain operation.
Installation tool compatibility
Removal is specified with the TL-UN74-S adapter tool reference; mounting bolts are not included.