The quality and performance-oriented Shimano BB-UN300 cartridge bearing bottom bracket features a JIS square taper mount and is designed for frames with BSA thread and 68 mm shell width. A stabilizer ensures a constant chain line.
axle: steel
| Activity: | Cycling | 
| Material: | Aluminium, Steel | 
| Item code: | SHI472227 | 
| Model year: | 2023 | 
| Axle length: | 127.5mm | 
| Manufacturer: | Shimano Parts | 
| Product name: | Shimano BB-UN300 Bottom Bracket - BSA 68mm - JIS Square Taper - 127.5mm (D-EL) | 
| Usage bikesport: | Trekking, MTB, City | 
| Manufacturer page: | http://www.shimano-europe.com/ | 
| Bottom bracket type: | BSA | 
| Manufacturer item code: | EBBUN300B27B | 
| Bottom bracket case width: | 68mm | 
| Bottom bracket axle profile: | Square | 
| Bottom bracket construction: | Cartridge Bottom Bracket |