BB UN300 Square Taper Bottom Bracket For 68mm Shell, 113mm Spindle, JIS Crank Fit, 1.37 Inch Shell ID, Cartridge Bearing, BSA Shell, Durable Performance For Road And Mountain Bikes

Square Taper BB UN300 for 68mm shell, 113mm spindle
✔️ Fits JIS square-taper cranks on 68mm shells, 113mm spindle

This sealed cartridge bottom bracket is designed for square-taper cranks and is commonly used on road and mountain bikes with a 68mm shell width and 1.37 in (34.8 mm) shell ID.

✅ 68 mm shell width (2.68 in)
✅ Spindle length 113 mm (4.45 in)
✅ Shell ID 1.37 in (34.8 mm)
✅ Fits JIS square-taper cranksets in BSA shells

💡 What is a square-taper bottom bracket used for in bikes with JIS cranks? This handy component keeps crank arms aligned and power transfer smooth across road and mountain setups.

• Reliable cartridge bearing for low-maintenance, long life
• Supports 68mm shell width and 1.37 in shell ID shells for standard JIS cranks
• Designed for sealed operation, reducing friction and wear
• Common choice for BSA threaded shells in both road and off-road bikes