The MTB-OTHERS Bottom Bracket BB-UN300 (122.5MM, Without Fixing Bolt) is crafted to be the unsung hero of your mountain bike’s drivetrain—quietly powerful, exceptionally durable, and engineered for the wildest trails. Its design embraces simplicity without compromise, offering riders a seamless connection between their pedaling force and the trail beneath.

This bottom bracket’s heart is a precision-machined bearing system that spins effortlessly, translating every ounce of energy into forward motion with minimal drag. Built to endure the rigors of off-road adventures, its robust sealed bearings fend off dirt, water, and grit, ensuring that harsh conditions won’t slow you down or demand constant maintenance.

Without a fixing bolt, the BB-UN300 reduces complexity, allowing for easier installation and servicing while maintaining rock-solid stability under pressure. It’s ideal for riders who want performance without fuss, blending reliability with straightforward engineering.

The 122.5mm shell width caters to a range of mountain bike frames, offering versatility and compatibility with various cranksets. Whether you’re hammering steep climbs, bombing down technical descents, or cruising through rugged terrain, this bottom bracket provides a smooth, consistent pedal stroke that keeps you locked in and in control.

More than just a component, the BB-UN300 is a trusted companion for riders who demand longevity and flawless function from their equipment. It quietly supports your ride, so you can focus on the trail ahead, pushing limits without hesitation.