Product description A durable, precision bicycle headset engineered for frames with a 44 mm upper head tube and either a 44 mm or 50.6 mm lower head tube. Works with both straight and tapered fork applications to deliver smooth steering, longterm reliability, and easy maintenance. Key benefits Reliable, lowfriction steering: Two imported stainless steel sealed bearings ( and bottom) provide smooth rotation and quiet operation while keeping out water, grit, and debris. Durable construction: Forged aluminum alloy shell, CNC machined for precise fit, and anodized finish for corrosion resistance and longlasting appearance. Fast service and replacement: Toolfriendly design enables quick installation and removal, making routine maintenance or swapouts simple and efficient. Broad compatibility: Designed to fit common mountain and road bike standards so you can upgrade or your headset without frame or fork modification. Features and specifications Compatibility: Fits frames with a 44 mm head tube and either a 44 mm or 50.6 mm bottom (44 mm44 mm and 44 mm50.6 mm standards). Fork options supported: Straight fork configurations 28.6 mm/39.8 mm and 28.6 mm/33 mm; tapered fork configuration 28.6 mm/39.8 mm. Upper tube fit: Designed for a 28.6 mm outer diameter upper tube, a common standard on many mountain and road bikes. Bearings: Two imported stainless steel sealed bearings ( and bottom) for smooth, quiet rotation and protection against erosion and debris ingress. Material and finish: Aluminum alloy construction with forged, CNCmachined shell and anodized finish for consistent tolerances and corrosion protection. Installation: Toolassisted design for quick setup and removal during maintenance. Practical use scenarios Upgrading an older road or mountain bike: worn stock headsets with sealed bearings and CNC precision for quieter, smoother steering. Regular maintenance in a home or setting: Fast, toolfriendly assembly makes bearing checks and replacements quicker, minimizing downtime. Building a commuter or trail bike: Use this headset when your frame has a 44 mm head tube and requires either a 44 mm or 50.6 mm lower head tube option, compatible with common straight and tapered fork standards. What this headset solves Eliminates rough or noisy steering caused by worn bearings with a sealed bearing system that keeps contaminants out. Provides a precise, longlasting fit with CNC machining and a forged aluminum shell that resists wear and corrosion. Reduces maintenance time with a design made for quick toolassisted installation and removal. Compatibility reminder head tube: 44 mm Bottom head tube: 44 mm or 50.6 mm Upper tube outer diameter: 28.6 mm Straight fork configs: 28.6 mm/39.8 mm and 28.6 mm/33 mm Tapered fork config: 28.6 mm/39.8 mm This headset retains the original specifications and functions while focusing on smooth performance, durability, and straightforward installation.