The SRAM BB30 Bearing Assembly Direct Fit 42×30 mm is a precision bottom bracket bearing kit designed for BB30 frames and cranksets that use a **42 mm inner diameter (ID) by 30 mm spindle** interface. These direct-fit bearings press straight into the bottom bracket shell without the need for additional cups or adapters, simplifying installation and reducing overall weight. Built for riders who want smooth, durable rotation and dependable support for high-load pedaling, this assembly delivers the performance you expect from SRAM’s drivetrain components.

Crafted with quality steel races and sealed bearing construction, the BB30 assembly provides consistent, low-friction rotation while resisting dirt, moisture, and wear. The direct-fit design ensures that the bearings sit precisely in the frame’s bottom bracket shell, helping maintain correct crank alignment and minimizing lateral play — which translates to efficient power transfer and a refined pedaling feel. Whether you’re on a daily road ride, pushing hard on gravel, or charging technical terrain, these bearings are engineered for reliable performance under varied conditions.

Installation involves pressing the bearing assembly into the shell with the appropriate tool, followed by seating the crank’s 30 mm spindle through the bearings for a snug, secure interface. Because the direct-fit format eliminates extra adapters or cups, it reduces stack height and saves grams — a small but meaningful advantage for riders seeking precision and simplicity. When it’s time to refresh worn bearings or build a new BB30-equipped bike, this assembly is an effective way to restore smooth bottom bracket performance.