SRAM DUB Threaded English (BSA) Bottom Bracket — 68/73mm Shell, 55mm Chainline, Sealed Bearings

The SRAM DUB English (BSA) 68/73mm bottom bracket is a sealed, threaded unit built for SRAM Boost cranksets with a 55mm chainline to deliver reliable, low-maintenance power transfer on English‑threaded frames.

If you run a SRAM Boost crankset and your frame uses English (BSA) threads at either 68mm or 73mm shell width, this bottom bracket gives a straightforward, durable interface between the oversized DUB spindle and your frame. It uses sealed steel cartridge bearings and SRAM’s Gutter Seal Technology to keep contamination out, while the DUB spindle design simplifies compatibility across multiple crank standards.

What makes the DUB spindle different from other bottom bracket spindles?

The DUB spindle is intentionally oversized and standardized by SRAM to reduce complexity across crank and bottom bracket pairings. That larger spindle diameter increases bearing engagement and stiffness where the crank meets the bearing, while allowing a single spindle standard to work with many frame and BB configurations.

• Oversized DUB spindle improves bearing contact and stiffness.
• Single DUB standard reduces the number of model-specific parts needed.
• Works with multiple BB standards when paired with the correct cups or adapters.

How does this BSA threaded bottom bracket resist dirt and water?

SRAM combines sealed cartridge bearings with Gutter Seal Technology to minimize ingress from the elements. The seals channel contaminants away from bearing contact points so bearings run cleaner for longer and require less frequent service.

• Sealed steel cartridge bearings keep lubrication contained and contaminants out.
• Gutter Seal Technology diverts grime away from bearing interfaces.
• Threaded BSA cups offer a tight mechanical fit in the frame shell for added protection.

Will this bottom bracket fit my frame and crankset?

This unit is built for English (BSA) threaded frame shells at 68mm or 73mm widths and for SRAM Boost cranksets specifying a 55mm chainline. Confirm your frame shell thread type and crankset chainline before purchase to ensure compatibility.

• Fits BSA (English) threaded frames, 68mm or 73mm shell width.
• Designed for SRAM Boost cranksets with a 55mm chainline specification.
• Comes as threaded cups in black for a direct screw-in installation.

What should I expect from installation and maintenance?

Installation is the typical screw‑in process for English threaded bottom brackets; use the appropriate tool and torque spec for your frame. After installation, the sealed bearings and seals reduce routine maintenance, but periodic checks for play and smooth rotation will extend service life.

• Screw-in threaded cups require a BSA bottom bracket tool during install.
• Torque to the manufacturer’s specification for a secure fit and best seal.
• Inspect for smooth rotation and absence of play; replace bearings if rough or loose.

Who is this for: Riders and mechanics looking for a low-maintenance, frame-specific solution to pair SRAM Boost cranksets with English-threaded MTB frames. Choose this bottom bracket if you need a durable, sealed unit tailored to a 55mm chainline and 68/73mm BSA shell widths, and want simplified compatibility through SRAM’s DUB spindle standard.