SRAM DUB PF92 Press-Fit Bottom Bracket — 92mm BB92 Shell, 28.99mm DUB Spindle, Sealed Bearings

SRAM's DUB PF92 bottom bracket is a sealed cartridge press-fit unit built for Boost mountain bike cranks with a 55mm chainline and an oversized 28.99mm DUB spindle.

This press-fit bottom bracket is engineered to mate Boost-spec SRAM cranks to a BB92 shell (41mm inner diameter, 92mm wide) and deliver durable, low-maintenance rotation from sealed steel bearings. It adapts the DUB oversized spindle standard to a wide MTB shell, simplifying crank installation while maintaining correct chainline for modern Boost drivetrains.

What makes the PF92 version different from other SRAM bottom brackets?

The PF92 designation indicates a press-fit assembly intended for 92mm-wide shells with a 41mm inner diameter — a common fit on many modern mountain frames. The DUB architecture uses a 28.99mm spindle diameter, allowing broad compatibility across SRAM crank product lines while keeping bearing contact and stiffness optimized.

• Press-fit design sized for 92mm shell width and 41mm ID
• Sealed cartridge steel bearings for reliable performance
• Oversized 28.99mm DUB spindle compatibility for SRAM cranks
• Engineered for Boost 55mm chainline applications

How does this bottom bracket help keep my drivetrain aligned?

Using the correct PF92 unit ensures your crankset sits at the intended 55mm chainline, which is crucial for shifting precision and driveline efficiency on Boost setups. The press-fit shell sizing places the bearings at the correct lateral position so chainrings track properly relative to the cassette.

• Positions crank for a 55mm chainline on Boost frames
• Reduces lateral play with appropriate bearing placement
• Maintains consistent chainring-to-cassette alignment for smooth shifting

How durable and serviceable are the sealed cartridge bearings?

SRAM supplies sealed steel cartridge bearings in this unit to resist contamination and reduce routine maintenance compared with loose-bearing designs. When bearings do wear, the cartridge format makes replacement straightforward — swap the cartridge rather than rebuild individual bearings.

• Sealed cartridges limit dirt and moisture entry
• Steel bearings offer robust wear resistance under load
• Cartridge replacements are simple and widely available

Which cranks and frames are compatible with this DUB PF92 unit?

This bottom bracket is made for SRAM DUB cranksets specified for Boost geometry with a 55mm chainline and for frames that accept press-fit BB92 (41mm ID, 92mm width) shells. It supports any SRAM crank that uses the DUB 28.99mm spindle standard and expects the PF92 spacing.

• Compatible with SRAM Boost cranksets engineered for 55mm chainline
• Fits press-fit BB92 shell: 41mm inner diameter, 92mm wide
• Works with all SRAM cranks using the DUB 28.99mm spindle standard

Who is this for: Riders and bike builders running SRAM Boost cranksets who need a reliable press-fit solution for frames with BB92 shells. It’s ideal for mountain bikers who want the DUB oversized spindle benefits—straightforward installation, broad crank compatibility, and sealed bearings that cut down on maintenance—on frames using 92mm press-fit bottom bracket shells.