They include custom-made replaceable stainless steel bearings

5mm and 39mm outside diameter bottom bracket cups

Also included are two bushings which are used with the Park bearing press (sold separately) to safely press fresh bearings into your frame

Compatible with Park Tool Freewheel Removers (FR-1

Laugh in the face of cold weather

Park BBT-59.2 41mm OD External BB Tool - Grey Out of Stock They include custom-made replaceable stainlessA CNC machined BB tool for external, 16 notch bottom brackets. recently updated for improved fit on today's high performance BBs and laser engraved so it is easy to pick it out of your toolbox. Compatible with a 3 8 torque wrench. Fits: 16 notch 41mm cups Shimano BBR60 (Ultegra 11 speed 6800 series) and Shimano MT800 BBs