The MTB-OTHERS Bottom Bracket BB-UN300 designed for BSA 73mm shells with a 122.5mm (LL123) spindle length offers an uncompromising blend of durability and precision tailored for off-road enthusiasts. This component embraces the rugged demands of mountain biking, ensuring your power delivery remains smooth and consistent even in the most challenging terrains.

Encased within robust seals, its bearings are shielded from grit, mud, and moisture—elements that can often diminish performance and longevity. This thoughtful protection means fewer maintenance worries and more focus on your ride, whether you’re shredding technical trails or powering up steep inclines.

The square taper spindle provides a time-tested, sturdy connection that transmits pedal strokes with impressive efficiency, translating your effort directly into forward momentum. With the 122.5mm spindle length, it achieves an ideal chainline alignment, harmonizing perfectly with your crankset to optimize gear shifts and drivetrain life.

Offered without a fixing bolt, this bottom bracket gives you the freedom to tailor your setup—perfect for custom builds or replacements where compatibility is key. Packaged individually, it arrives ready to be seamlessly integrated into your bike, reinforcing your ride with reliability and smooth operation.

In essence, the BB-UN300 is more than just a bottom bracket—it's a resilient foundation crafted to empower every pedal stroke, delivering consistent performance and endurance for mountain bikers who demand nothing less than excellence.