Prepare BSA bottom bracket shells for perfect cup seating. The Unior BSA bracket shell facing tool (Part #626476) machines the faces of the BB shell flat and parallel, ensuring BB cups seat squarely and the bearing axes are perfectly aligned — eliminating drivetrain flex, creaking, and premature bearing wear.

• Faces BSA bottom bracket shell to produce flat, parallel seating surfaces
• Ensures BB cups seat squarely for correct drivetrain alignment
• Eliminates manufacturing imperfections in BB shell facing
• Precision cutters maintain strict parallelism between drive and non-drive faces
• Professional Unior build quality for accurate, repeatable results

An unfaced BB shell can cause BB cup misalignment, creaking under load, and accelerated bearing wear. The facing tool is standard practice in precision frame preparation — especially important on welded aluminium and steel frames where the shell faces may not be perfectly true from the factory.

For BSA (British Standard) threaded bottom bracket shells. Pair with the Unior BSA BB tapping tool for complete BB shell preparation. For Italian-shell facing, see related Unior tools.