SRAM DUB BB30 73mm (55mm Chainline)
SRAM

SRAM DUB BB30 73mm (55mm Chainline)

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SRAM DUB BB30 press-fit bottom bracket for 73mm BB30 shells with a 55mm chainline. Features sealed steel bearings and a 28.99mm DUB interface for reliable, low-friction performance.

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Product Details

Overview & Technology: What the DUB BB30 Offers

SRAM's DUB BB30 (Model ID: BB-DUB-BB30-A1) brings the DUB axle standard to BB30 frames, delivering a simple, robust press-fit solution for frames with a 73mm BB30 shell and a 55mm chainline. The unit pairs a 28.99mm DUB spindle interface with sealed steel bearings housed in precision cups (42mm cup diameter) for consistent bearing alignment and long life. Why DUB? The DUB system standardizes the spindle diameter at 28.99mm to improve bearing placement, reduce creak from poor tolerances and increase compatibility across SRAM road, gravel and mountain cranks. This BB30-specific assembly maintains BB30’s large shell benefits — stiffness and lightweight — while giving you the durability and seal performance riders expect from modern press-fit systems.

Key Features & Construction

This DUB BB30 is built around sealed steel bearings optimized for long service life and smooth rolling under load. The DUB interface creates a snug, precise fit between the 28.99mm crank spindle and the bearings, minimizing lateral play and drivetrain noise. The cups measure 42mm in outer diameter to match BB30 shells and are finished in black to match modern builds. Key construction highlights include: • Steel sealed bearings for durable, low-friction operation. • Precision-machined DUB interface to fit 28.99mm spindles. • 42mm cup diameter designed for BB30 press-fit shells and 73mm shell width.

Fit & Compatibility: What Works with This BB

This unit is specifically for frames with a BB30 shell, 73mm width and is pre-set for a 55mm chainline. It is compatible with SRAM cranks that use the DUB 28.99mm spindle (road, gravel and many MTB DUB cranks). It will not accept 24mm Shimano/HTII spindles or older 30mm spindle standards without a dedicated adapter. Before buying, confirm these three measurements on your frame and crankset: • BB shell type: BB30 (42mm internal diameter seating) • BB shell width: 73mm • Crank spindle diameter: 28.99mm DUB interface If your frame uses a different press-fit standard (PF30, BB86, BB92) or your crank uses Shimano 24mm or SRAM GXP, choose the matching DUB/adapter variant for correct fit.

Who This Is For: Riders & Builds Suited to DUB BB30

This bottom bracket is ideal for riders running a BB30 shell who want the simplicity and wide spindle benefits of SRAM’s DUB system. It’s a great option for gravel and mixed-surface riders seeking a stiff, reliable spindle interface with a 55mm chainline — especially when using modern SRAM DUB cranksets. Choose this BB if you value a durable, low-maintenance press-fit solution that reduces drivetrain play and noise. Mechanics and home wrenchers will also appreciate the straightforward press-fit install and the compatibility with the broad DUB crank family.

Key Features

  • ✓ DUB interface for 28.99mm SRAM spindles and consistent bearing placement
  • ✓ Designed for BB30 shells with 73mm shell width and 55mm chainline
  • ✓ Sealed steel bearings for longevity and low rolling resistance
  • ✓ 42mm cup diameter matches BB30 press-fit frame bores
  • ✓ Black finish integrates cleanly into modern builds
  • ✓ Compact, lightweight press-fit assembly — 0.25 lb shipped weight
  • ✓ SRAM Model ID BB-DUB-BB30-A1 — OEM-quality fit and finish

Specifications

BB Shell Type BB30
BB Shell Width 73mm
BB Bearing Steel
Crank Spindle Diameter 28.99mm
Interface DUB
Cup Diameter 42mm
Primary Color Black

Product Identifiers

Vendor Item # 00.6418.017.004
UPC 710845857935

Frequently Asked Questions

Is this bottom bracket compatible with my SRAM DUB crank?

Yes — provided your crank uses the DUB 28.99mm spindle. This unit is designed for BB30 shells (42mm bore) with a 73mm shell width and a 55mm chainline. Confirm your crank is DUB-compatible before purchase.

Can I use this BB in a PF30 or BB86/92 frame?

No — this product is specifically engineered for BB30 shells. PF30, BB86 and BB92 have different bore diameters and often require a different cup or adapter. Use the correct press-fit standard or a frame-specific adapter to ensure proper bearing preload and alignment.

How do I install this press-fit BB30 DUB unit?

Press-fit installation requires a compatible BB press tool to press the cups squarely into the BB30 shell. Use a BBT-69 style or SRAM-recommended press tool and follow torque/fit guidance for your frame. If you’re not confident, have a shop press it in to avoid frame damage.

What maintenance does this bottom bracket need?

The sealed steel bearings require minimal maintenance; regular cleaning of the surrounding area and periodic drivetrain checks are usually enough. Replace bearings if you notice roughness, play or grinding — generally service intervals depend on conditions, but expect several thousand kilometers in dry conditions.

Will this BB eliminate creak in my press-fit frame?

A proper DUB BB30 installed correctly reduces creak by improving spindle-to-bearing alignment and sealing. However, creaks can originate from many sources (frame shell faces, cable routing, crank preload). Ensure correct installation, clean mating surfaces and use appropriate assembly compound where recommended.

Can I use this with 1x and 2x drivetrains?

Yes — the 55mm chainline is compatible with many 1x and 2x SRAM crank configurations. Confirm your crank and cassette setup for ideal chainline and shifting performance.

Buying Guide

When choosing a press-fit bottom bracket, match the BB standard (BB30, PF30, BB86, etc.), shell width, and crank spindle diameter. For SRAM DUB systems, confirm your crank uses the 28.99mm DUB spindle — buying the wrong interface is the most common mistake. Also consider bearing material and seal quality. Sealed steel bearings like those in this unit offer an excellent balance of durability and cost; ceramic options exist for marginal weight and friction savings but usually at higher cost. If you ride wet or muddy gravel, prioritize robust seals and regular inspection intervals.

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