Optimize your bicycle's performance with the BB-UN300-K Bottom Bracket - a , durable component engineered for seamless compatibility with chain cases and JIS square-taper cranksets. Measuring 68mm in shell width with a 117.5mm spindle length, this bottom bracket ensures precise fitment and smooth rotation for a variety of touring, commuter, and hybrid bikes. Materials & Durability: Constructed with a robust hollow spindle and high-grade materials, the BB-UN300-K offers exceptional strength and longevity. Its corrosion-resistant black finish withstands tough riding conditions, making it an ideal choice for everyday commuting and long-distance touring. Performance & Engineering: Designed for optimized power transfer, this bottom bracket features precision-machined components and smooth-running bearings that reduce friction and enhance pedaling efficiency. The hollow spindle design lightens overall weight without compromising strength, providing a balanced blend of performance and durability. Components & Technology: Compatible exclusively with chain cases and fitting JIS square-taper cranksets, this bottom bracket supports reliable and secure crankset attachment. Please note that crank arm fixing bolts are sold separately. Its sealed bearing design helps keep dirt and moisture out, ensuring consistent performance over time. Style & Use Case: With its sleek black finish and versatile dimensions, the BB-UN300-K complements a wide range of bicycles geared towards touring, city riding, and hybrid cycling. Ideal for riders seeking a functional upgrade that offers smooth operation, added protection against the elements, and excellent compatibility with chain case setups. Innovative Features: - Hollow spindle for lightweight strength - Designed specifically for chain case applications - Compatible with JIS square-taper cranksets for easy installation and maintenance Upgrade your bike's drivetrain with the BB-UN300-K Bottom Bracket