SRAM's DUB T47 Wide bottom bracket is the piece that lets you run a DUB Wide crankset in a frame with an 85.5mm T47 threaded shell. It's compatible with SRAM Road and Road Wide cranksets and frames with 85.5mm T47 BB shells, with included spacers required when running a Road Wide crank. If you're building or refreshing a modern road or gravel bike with a T47 shell — increasingly the standard on frames that used to spec press-fit — and you're running a SRAM Wide crankset for tire clearance or 1x drivetrains, this is the direct replacement.

The DUB system is SRAM's answer to the compatibility mess that BB30, PF30, and GXP created over the past decade. By using a 28.99mm axle, the DUB bottom bracket runs bigger bearings than bottom brackets built for 30mm crank axles, which helps durability and stiffness while keeping weight down. The oversized spindle also means one crankset can move between frames with different shell standards as long as you have the correct DUB bottom bracket for the shell — useful if you swap frames or run more than one bike.

The "Wide" designation matters here and is easy to get wrong at the parts counter. SRAM's Wide cranksets — Red XPLR Wide, Force Wide, Rival Wide — use a longer spindle to push the chainline outboard for tire clearance and 1x gearing, and they require this specific Wide-variant bottom bracket rather than the standard DUB T47. The 2.5mm and 5.5mm spacers included with this bottom bracket handle the correct chainline setup for Wide cranks on an 85.5mm T47 shell. ... Read More