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.
• Sealed, compact bearing unit for square taper crankset • Maintenance-free • Material: Steel (axle), aluminum • Spindle Interface Type: Square Taper JIS • Shell width: 68mm • English threads: 1.37" x 24t • Spindle Length: 113mm / 123mm / 127mm • Weight: +/-300g
