Park Tool BBT-27. 3 Bottom Bracket Tool Precision CNC-Machined If you want to replace your old, worn-out bottom bracket with a new one or you want to upgrade to something better, you'll need some tools to get the job done. The Park Tool BBT-27. 3 Bottom Bracket Tool fits 16-notch threaded bottom brackets with a major diameter of 48-50mm and a minor diameter of 46. 4mm. These bottom brackets include FSA Mega Evo, Wheels Manufacturing T47, and Wheels Manufacturing PF30. Features Fits 16-notch threaded bottom brackets with a major diameter of 48-50mm and a minor diameter of 46. 4mm Fit includes: FSA Mega Evo, Wheels Manufacturing T47, and Wheels Manufacturing PF30Note: Does not fit Hope BSA30Manufacturer's part number: BBT-27. 3UPC: 763477001368Related articles: Bottom Bracket Removal & Installation: Threaded | Park Tool | Bbt-27. 3 Bottom Bracket Tool Bbt-27. 3