Shimano BB UN300 bottom bracket British thread, 68 117.5 mm for chaincase, Silver

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

Amazon

Hardshimano material No age restriction For squeezing inner bearings Left and right bearing shell