Shimano BB-UN300 Bottom Bracket 68x117.5mm Square Taper JIS BSA Threaded

• Fits JIS square-taper cranksets
• SHIMANO quality/performance cartridge bearing square bottom bracket
• Adapter material: Aluminum
• Better chainline stability with chain line stabilizer

The BB-UN300 is a square spindle bottom bracket designed to fit JIS square-taper cranksets. It has a 68mm shell width and an English (BSA) threaded frame interface. The spindle length measures 117.5mm with a 1.37-inch bottom bracket shell inner diameter. Note that crankarm fixing bolts are sold separately.