AEROZINE BSA30 → SRAM DUB Adapter — Precision Fit for Modern Cranks

When we set out to design the AEROZINE BSA30 to SRAM DUB Adapter, it wasn’t just another small part on a spec sheet — it was a solution to a real problem many riders face: How do I install a modern SRAM DUB crankset on a classic English-threaded BSA frame? This adapter bridges that gap with precision, simplicity, and durability, letting you unlock high-performance cranks on more bikes than ever before.

🔧 Why We Designed It — A Real Solution for Modern Builds

🚴‍♂️ Compatibility Evolved Faster Than Frame Standards

As frame and crank standards evolved, we noticed a common dilemma: riders with older or traditional BSA threaded frames — especially 68 mm BB shells — wanted to use today’s SRAM DUB cranksets (which use a 28.99 mm spindle standard). But BSA* threads weren’t originally designed to accept a DUB spindle directly.

So we asked:
“Why should ride quality be limited by your frame’s age?”

The result is this adapter — a simple, engineered shim kit that lets you install SRAM DUB cranks in a BSA30 setup by adapting the shell and bottom bracket to the proper interface.

🛠 Design Highlights — What Makes It Work

✔ Precision-Milled Alloy Shim — Converts a BSA30 bottom bracket to fit SRAM’s 29 mm DUB spindle with accurate tolerances that preserve bearing alignment and drivetrain smoothness.
✔ Spacer Kit for Fine Tolerance — Includes multiple spacers so you can dial in assembly tolerance and ensure perfect crank install without play.
✔ Minimal Added Weight — At only ~5 g, this adapter doesn’t compromise your bike’s weight or ride feel.
✔ Engineered for Multiple BB Standards — Compatible with BSA(30), PF4130, BB30, PF30, and PF4230 shells.

🚴‍♂️ Ride Scenarios — When You’ll Notice the Difference

🛣 Upgrading an Older Frame

Got a classic threaded road frame or gravel build? Swap in a modern SRAM DUB crankset with confidence — no need for an expensive new frame or press-fit overhaul.

🏞 Maintaining Performance on Mid-Level Builds

Even on mid-tier bikes, pairing a quality bottom bracket (30 mm) with SRAM DUB crank arms elevates pedaling stiffness and durability — especially useful for riders who push hard on climbs and flats alike.

⚙ Cross-Brand Builds

If you’re mixing Shimano chainrings with a SRAM DUB crank arm, this adapter helps ensure everything lines up and functions smoothly — giving you cross-brand flexibility without guesswork.

⚖️ Comparison — Why This Adapter Matters

Many bottom bracket adapters lack the engineering needed for perfect alignment; this one was designed from the ground up to deliver a precise fit that protects bearings and preserves smooth pedaling — not just squeeze the parts together loosely.

📐 Buying & Fit Guide — Selecting the Right Adapter Setup

🔍 Does This Fit Your Frame?

This adapter is ideal if you have:
✔ A BSA threaded bottom bracket shell (commonly 68 mm)
✔ A goal to run SRAM DUB cranksets on that frame
✔ A 30 mm bottom bracket standard that needs spacing correction

If your frame uses PF30, BB30, PF4130, or PF4230 shells, this adapter still assists in fine-tuning spacing and spindle fit.

Make sure you:
➡ Check your shell width and diameter before purchase
➡ Measure the future crank spindle length and verify clearance
➡ Identify whether your current BB is already BSA30 or requires conversion

🧰 Installation Tips & Accessories

🛠 Installation Notes

✔ Install the adapter shim before pressing in the bottom bracket cups — this keeps the spindle centered and bearings aligned
✔ Use included spacers to eliminate axial play and ensure optimal chainline
✔ Apply grease to shim and spacer interfaces to prevent noise and corrosion

🧩 Recommended Supporting Parts

To get the best performance from your conversion:

• High-Quality 30 mm Bottom Bracket — Choose a bearing set that matches your shell (e.g., BSA30) for reduced resistance and long life.

• Proper Torque Tools & Grease — Secure installation prevents creaks and premature wear.

• Correct DUB Spindle Crankset — Matching the adapter with the correct SRAM DUB crank ensures smooth drivetrain performance.

👤 Who This Adapter Is For — And Who It’s Not

👍 Perfect For

✔ Riders with classic BSA frames who want to smooth upgrade to SRAM DUB cranksets
✔ Cyclists building a custom road/gravel bike with mixed component brands
✔ Riders who want fine-tuned spacing control and precise crank installation

👎 Not Ideal For

✘ Frames without BSA or related shell standards (may require other BB solutions)
✘ Riders expecting a universal “plug-and-play” part — this is a precision adapter designed to be installed thoughtfully
✘ Setups already using a dedicated SRAM DUB bottom bracket standard (might not need an adapter)

❤️ Engineered By Riders — For Riders Who Refuse Compromise

We created the AEROZINE BSA30 to SRAM DUB Adapter not because it was easy, but because we encountered the same issue — wanting to run modern, stiff crank spindles on classic frames without compromises. This adapter gives you cross-standard capability, refined spacing control, and a reliable, engineered fit — so every pedal stroke feels smoother, more direct, and more controlled.

Upgrade your drivetrain compatibility — and open your BSA frame to the performance world of SRAM DUB. 🚴‍♂️🔥
👇 Questions about fit or installation? Drop a comment or message us — we’ll help you dial it in.

PRODUCT  SPECIFICATION