Enhance your bike’s performance and durability with this high-quality Bike BC Bottom Bracket, expertly crafted from durable aluminum alloy combined with nylon for optimal strength and lightweight design. Engineered for precision and reliability, this bottom bracket is ideal for 68-73mm (2.7-2.9in) threaded bottom bracket shells, delivering smooth power transfer and sealed bearing protection for mountain bikes, road bikes, fixed gear bikes, and folding bikes. Key Features: · Superior Waterproof and Dustproof Design: Equipped with a separable rubber gasket that ensures gapless movement and prevents dust and moisture ingress, offering reliable waterproofing and enhanced bearing protection. · Low Resistance Lubrication: Features double-sided sliding separable rubber gaskets that maintain smooth rotation without increasing bearing resistance, ensuring high-efficiency lubrication. · Enhanced Groove Sealing: Newly designed anodized aluminum alloy end cover improves drainage sealing performance, reduces sealing resistance, and upgrades the overall high-end appearance. · Rigid Aluminum Alloy Shaft Bushing: Provides direct crank power transmission without plastic elasticity, minimizing power loss and protecting the bearing, while offering superior rigidity and durability. · Lightweight and High-Strength Aluminum Alloy: Combines the benefits of high metal strength with light weight, maintaining the performance demands of modern bikes. · Precision CNC Turning: Ensures accurate fit and smooth operation, promoting stability and longevity in diverse cycling conditions. Specifications: · Material: Aluminum Alloy + Nylon · Length: Approx. 90mm / 3.5in · Outer Diameter: Approx. 44mm / 1.7in · Inner Diameter: Approx. 24mm / 0.9in · Thread Pitch: Approx. 35mm / 1.4in · Wheelbase Compatibility: 68-73mm / 2.7-2.9in Threaded Bottom Bracket Shells · Suitable Bike Types: Mountain Bike, Road Bike, Fixed Gear Bike, Folding Bike Package Includes: · 1 x Bike BC Bottom Bracket This Bike BC Bottom Bracket delivers an exceptional combination of waterproof sealing, low friction, and robust construction to optimize your cycling experience. Its high-quality materials and advanced design make it a reliable upgrade for riders seeking improved power transfer, durability, and smooth operation across various bike types.