The BOTTOM BRACKET BB-UN300 with a square-type spindle and BSA 68mm shell—featuring the XL118 spindle length and delivered without a fixing bolt—represents a perfect blend of simplicity and performance for riders who demand dependable drivetrain efficiency. Crafted with attention to detail, this bottom bracket excels in delivering fluid pedal strokes while standing resilient against the rigors of everyday cycling.

Its sealed bearing system acts as a fortress, safeguarding internal components from dust, water, and road debris, thus ensuring smooth, whisper-quiet operation and an extended service life. This thoughtful design keeps maintenance minimal, letting you focus more on the ride and less on upkeep.

The square taper spindle, a classic and proven interface, guarantees a rock-solid connection to your crankset, channeling your power with precision and consistency. The XL118 spindle length ensures optimal chainline alignment, critical for maximizing drivetrain performance and reducing wear on components.

Absence of a fixing bolt in this pack allows seasoned mechanics and custom builders the flexibility to choose their preferred securing method, catering to specific build preferences or upgrades. This adaptability makes the BB-UN300 not just a component, but a versatile solution tailored to meet diverse cycling needs.

Whether you’re carving through urban streets, tackling challenging trails, or enjoying a weekend ride, this bottom bracket stands as a reliable foundation, delivering smooth, consistent pedaling and supporting your cycling journey with steadfast durability. It’s engineered not just to function, but to elevate your overall riding experience.