Bottom Bracket — Aircraft-Grade Aluminum Alloy, 68–73 mm shell, 24x24 mm Why you need this bottom bracket Durable, lightweight construction that withstands hard use: the aircraft-grade aluminum alloy shell and high-quality metal core deliver superior strength and wear resistance without adding unnecessary weight. Smooth, efficient pedaling: precision-machined parts and an optimized interface reduce friction and wobble so more of your effort is transferred to the drivetrain. Long-term, low-maintenance performance: dual silicone-rubber seals keep water, dust, and grit out of the bearings to prevent premature wear in demanding conditions. Key features and benefits Material and build: premium aluminum-alloy housing with a robust metal core provides high load capacity and durability while remaining light for aggressive riding and long rides. Compatibility and fit: engineered for standard frame shells 68–73 mm wide with a 24x24 mm inner diameter to fit a wide range of mountain bike frames and integrated cranksets. Sealed bearings: two silicone rubber seals form a reliable barrier against moisture, mud, sand, and dirt, maintaining smooth bearing operation and extending service life. Performance focus: precision-mated interface for modern integrated cranksets reduces friction and improves power transfer, resulting in more responsive pedaling and consistent performance. Practical applications / use scenarios Aggressive trail riding: built to endure repeated impacts, mud and rough terrain while keeping pedaling smooth and wobble-free during technical climbs and descents. Long-distance rides and touring: lightweight strength and sealed bearings reduce maintenance needs between long rides or multi-day tours. Wet, sandy, or muddy conditions: dual silicone seals protect bearings from contaminants encountered in rain, coastal rides, or muddy trail sections. Compatibility summary Frame shell width: 68–73 mm Inner diameter: 24x24 mm Intended for most mountain bike frames and modern integrated crankset systems What this solves Replaces worn or noisy bottom brackets with a more durable, sealed solution Reduces drivetrain friction and lateral play for more efficient pedaling Minimizes bearing failure and maintenance caused by water, sand, and mud Reliable, performance-oriented bottom bracket designed to deliver smoother pedaling, improved power transfer, and long-lasting service in demanding mountain bike and touring applications.