Shimano BB-UN101 Square Taper Bottom Bracket 68mm Shell Width 123mm Axle Length Bicycle Square Crank BB

Shimano BB-UN101 Square Taper Bottom BracketModel: BB-UN101-KShell Width: 68 mmAxle Length: 123 mmThread Standard: BC1.37 British thread✅ Original Shimano BB-UN101 sealed bottom bracket, square taper interface, fit square crankset✅ Spec: Shell width 68mm, axle length 123mm, British thread BC1.37✅ Sealed bearing design, dustproof & waterproof, low noise, long service life✅ Compatible with MTB, city bike, trekking bike, 6/7/8/9 speed drivetrain✅ Easy installation, professional bike replacement spare partThis square taper bottom bracket adopts sealed cartridge bearing structure, effectively preventing dust and water infiltration. Stable rotation, less friction, reduces abnormal creaking noise during riding.Wide compatibility for mountain bikes, commuter city bikes, trekking bicycles with square taper crank, suitable for 6 to 9 speed groupsets.💡 Note:Please confirm your frame shell width and required axle length before purchasing to avoid mismatching. Professional installation tools are recommended for assembly.