STANDARD BOTTOM BRACKET, BB-UN300, SPINDLE: SQUARE TYPE, SHELL: BSA 73MM, SPINDLE: 122.5MM (D-NL), W/FIXING BOLT

Shimano Standard Bottom Bracket, BB-UN300: An Essential for JIS Square-Taper Cranksets

The Shimano BB-UN300 is a high-quality, standard bottom bracket designed to fit JIS square-taper cranksets. It features a hollow spindle for reduced weight and increased performance, making it an ideal component for any serious cyclist or bike enthusiast.

With a shell size of BSA 73mm and a spindle size of 122.5mm (D-NL), this bottom bracket ensures optimal fit and performance. While it comes with a fixing bolt, please note that crankarm fixing bolts are sold separately.

• Designed for JIS square-taper cranksets
• Features a hollow, square type spindle for reduced weight
• BSA 73mm shell size for optimal fit
• 122.5mm (D-NL) spindle size
• Includes a fixing bolt