Shimano BB UN300 bottom bracket British thread, 68 122.5 mm (LL123) for chaincase, Silver

Amazon

Eje Pedalier BSA 122.5/68mm compatibility simplifies service work when replacing worn units or refreshing a drivetrain setup Low friction rotation improves pedalling feel, helping riders maintain cadence across longer or harder rides Workshop friendly dimensions support accurate installation, reducing creaks and preserving crank alignment 68mm / 122.5 / BB-UN300 bottom bracket standard supports smooth crank rotation, stable bearing support and efficient power transfer Sealed bearing construction helps protect the interface from dirt, moisture and daily riding stress, Weight: 0.68 Pounds, Manufacturer: SHIMANO

Blacks

Features:A good quality bottom bracket for traditional chainsetsSuper-accurate bearings for smooth operation and improved durabilityDurable, hard-wearing sealed cartridge bottom bracket with square tapered spindle fittingMaintenance-free sealed cartridge bearing assembly keeps out dirt, mud, and water for long bearing lifeFast and easy installation without adjustmentNarrow body allows clearance for cable routing under the bottom bracket