Enhance your bike’s performance and durability with this high-quality Bike Headset Bottom Gear, expertly crafted to fit frames with head tube inner diameters ranging from 41.8mm to 52mm (1.6 to 2 inches). Designed for compatibility with ordinary 28.6mm (1.1 inch) straight tube front forks or standard 1.5 inch tapered tube front forks, this headset bottom gear offers a precise fit and smooth handling for road and high-end mountain bikes. Key Features: · Premium Aluminum Alloy Construction: Made from T6 heat-treated high-strength aluminum alloy with CNC machining, this headset bottom gear is lightweight (approx. 116g / 4.1oz) yet highly durable, ensuring long-lasting strength without added weight. · Superior Waterproof and Anti-Corrosion Design: Equipped with high-quality rubber seals and an additional waterproof ring in the bowl cover, it effectively resists water, corrosion, and sand intrusion, extending the service life of your headset. · Smooth Double Bearing System: Features double bearings that provide smoother rotation and easier maintenance compared to traditional loose ball bearings, resulting in lighter and more responsive handlebar turning. · Built-in Oil Seal for Enhanced Protection: The integrated oil seal offers high-efficiency waterproofing, prolonging headset life and preventing installation gaps for a secure, one-step installation process. · Versatile Fit and Open Design: The lower bowl diameter is tailored for frames with a 52mm (2 inch) inner diameter at the lower end of the head tube. Its open bottom block design, compatible with optional dual-purpose bottom blocks, offers added convenience and flexibility during installation and use. Specifications: · Material: Aluminum Alloy (T6 Heat-Treated) · Weight: Approx. 116g / 4.1oz · Dimensions: 41.8 x 28.6-52 x 30 or 39.8 mm (Specification: 1 1/8in + 1 1/2in) · Suitable For: Frame head tubes with upper and lower inner diameters of 41.8-52mm (1.6-2 inches) · Compatible With: Ordinary 28.6mm (1.1 inch) straight tube front forks or standard 1.5 inch tapered tube front forks (choose the corresponding option based on your fork type) This Bike Headset Bottom Gear combines precision engineering, durable materials, and advanced sealing technology to deliver smooth steering and reliable performance. Ideal for cyclists seeking a robust and maintenance-friendly headset solution for their road or mountain bikes.