Shimano Acera Bottom Bracket BSA 128mm 68mm - Silver

The Shimano Acera BB-UN300 is a sealed cartridge bottom bracket featuring a JIS square-taper spindle that provides smooth, durable performance for everyday riding. Designed for BSA 68 mm threaded frames and a 128 mm axle, it accommodates a wide range of square-taper cranksets. A built-in stabilizer ensures your chainline remains consistent, while the fully sealed design protects against rain and grit, allowing for long service intervals and quiet pedaling.

- The BB-UN300 offers reliable cartridge-bearing smoothness ideal for commuting, trekking, and fitness bikes.
- The JIS square-taper interface is compatible with popular Shimano square-taper cranksets from the Acera, Altus, and Tourney families, among others.
- The BSA 1.37"×24T threading and 68 mm shell standard guarantee broad frame compatibility and straightforward installation.
- The 128 mm spindle length supports common chainlines for city trekking and MTB drivetrains using square-taper cranks.
- A stabilizer element helps maintain a straight chainline for quieter shifting and reduced drivetrain wear.
- The sealed cartridge design keeps water and dirt out, ensuring low maintenance and reliable performance throughout the season.
- Installation requires a standard 20-tooth cartridge bottom-bracket tool, making for quick setup at home or in the workshop.
- Constructed from tough aluminum and steel, this bottom bracket delivers dependable performance at an accessible price point.

Specifications
Brand: Shimano
Model: Acera
Type: Bottom bracket BSA
Width: 68mm
Length: 128mm
Axle Material: Steel
Color: Silver