DUB Cranksets and Bottom Brackets

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Product model code and specification details can be identified with the serial number on the product. Model codes can be used to identify the product type, series name, model name, and product version associated with the production model year. Product details can be used to identify spare parts, service kit, and lubricant compatibility.

Model Code example: RD-XX-E-B1

RD = Product Type - Rear Derailleur

XX = Platform/Series - XX

B1 = Version - (B - Second generation, 1 - first iteration)

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Highly specialized tools and supplies are required for the replacement and maintenance of your SRAM components. We recommend that you have a qualified SRAM dealer work on your SRAM components.

SRAM DUB BSA bottom brackets are compatible with frame shells with English threads.

SRAM DUB T47 bottom brackets are compatible with frame shells with M47 x 1 threads.

SRAM DUB Italian bottom brackets are compatible with frame shells with 36 mm x 24 tpi threads.

Spray isopropyl alcohol on the bottom bracket shell and clean it. The shell should be free of dirt, paint, grease, and metal burrs. For best results, have your frame faced by a professional bicycle mechanic.

1. Apply grease to the inside of the frame shell.

2. Prepare the bottom bracket for installation. Remove the left side cup from the center tube. Remove the left side outer spacer, if applicable. Remove the right side outer spacer from the right side cup.

1. Use a 16-notch external bottom bracket tool to tighten the non-drive side cup into the frame.

2. Install the left external spacer as indicated by the spacer chart.

3. Use a 16-notch external bottom bracket tool to tighten the drive side cup into the frame.

4. Install the right external spacer as indicated by the spacer chart.

DUB T47 Spacer Chart

1. Apply grease to the indicated areas on the spindle.

2. Install the non-drive side crankarm and spindle into the bottom bracket. Make sure the blue o-rings remain installed in the gland in the left and right bottom bracket cups during spindle installation.

3. Install the drive-side crankarm onto the spindle.

4. Use a torque wrench with an 8 mm hex bit socket to tighten the crank arm bolt to 54 N·m (478 in-lb).

5. Use a rubber or plastic mallet to tap the drive side crank arm until it is fully seated.

6. Remove play from the system by turning the preload adjuster in the + direction until it stops or makes contact with the bearing shield.

7. Use a 2 mm hex wrench to tighten the bolt until the adjuster edges touch.

8. Check the crankset for play by rocking the crankarms back and forth.

9. Apply grease to the crank arm pedal threads.

10. Install the washer between the crank arm and pedal.

11. Tighten the pedal shaft to 54 N·m (477 in-lb) unless otherwise specified by the pedal manufacturer.

Inspect the crankset and bottom bracket for play, and tighten as needed. Clean the crankset and bottom bracket with water and mild soap.

Replace the bottom bracket when it no longer rotates smoothly.

Consult the Chainrings and Spiders User Manual on www.sram.com for complete torque specifications.

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