Shimano BB-UN300 Square Tapered Bottom Bracket

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