Bottom Bracket Shimano BB-UN300 Square Taper 73mm BSA

Bottom Bracket Shimano BB-UN300 Square Taper 73mm BSA

The Shimano BB-UN300 is a reliable and widely used bottom bracket designed for cranks with JIS Square Taper mounting. It offers a classic and durable solution suitable for MTB, city and hybrid bikes.

This bottom bracket is intended for frames with a BSA threaded bottom bracket shell and a width of 73 mm. Shimano’s proven manufacturing quality ensures smooth rotation, efficient power transfer and long service life.

The sealed bearing construction protects internal components from dirt and moisture, reducing maintenance requirements and increasing durability. The BB-UN300 is an excellent choice for riders who value reliability and simplicity.

• Model: BB-UN300
• Type: Square Taper (JIS)
• Thread: BSA
• BB shell width: 73 mm