Shimano
BB‑UN300‑LL123 Square Taper BB (BSA, 122.5 mm)
The Shimano BB‑UN300‑LL123 is a simple, reliable square‑taper bottom bracket designed for bikes with a 68 mm British‑threaded shell. Built with sealed cartridge bearings and a durable Cr‑Mo axle, it provides smooth rotation and long‑term dependability for a wide range of square‑taper cranksets. With a 122.5 mm spindle length, the BB‑UN300 is a direct replacement for the older BB‑UN26 and BB‑UN55 units.
Features
• Square‑taper bottom bracket for 68 mm BSA shells
• 122.5 mm spindle length
• Sealed cartridge bearings for low maintenance
• Durable Cr‑Mo axle
• Replaces BB‑UN26 and BB‑UN55
• Compatible with square‑taper cranksets
• Fixing bolts not included (Shimano FC‑E6000 bolts recommended)
• Silver finish
Shipping information
Ships in 2–3 business days with free delivery across Canada on orders over $99. Same‑day pickup available Tue–Sat (closed Sun–Mon).
Returns & warranty
Enjoy hassle‑free returns within 30 days on unused items in original packaging (excludes bikes and sale items). Free in‑store returns anytime.