What is SRAM DUB?

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SRAM DUB Crank - Bicycle Parts Direct


In 2018, SRAM introduced mountain bike cranksets which use a new technology name DUB™ (Durable Unified Bottom Bracket). Meant to simplify frame BB and crankset compatibility across their product lines, it brought about yet another standard to understand. In 2019, SRAM began rolling out DUB cranksets on their road cranksets. Once the SRAM road cranks went to DUB™, Wheels Manufacturing began producing a full line of DUB™-compatible bottom brackets.

There are two key features that directly relate to Wheels Manufacturing bottom brackets. The most significant feature is DUB™ cranksets use a 29mm diameter spindle, and therefore require specific bearings with a 29mm. We are currently shipping our DUB™-compatible BBs with Enduro 6806/29 ABEC-3 bearings. These have dimensions of 42mmx29mmx7mm. The bearings are matched to 29mm dust seals, and all Wheels Mfg DUB™-compatible bottom brackets include 29mm ID spindle spacers.

The second feature is SRAM DUB™ cranks come in only a few spindle length options. No more spindle lengths for use in 68mm or 73mm wide BB shells with internal bearings. In fact, the surface of the spindles are machined so that they will not work in bottom brackets with overall bearing widths less than 79mm. For frames with a BB shell width less than 86mm, you will most likely need to use a DUB™-compatible BB with external bearings.

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