What this product is Threadless headset sized 3434mm for standard 11/8' threadless mountain and road bike setups. Fits frames with a 34.0 mm inner diameter head tube and forks with a 28.6 mm outer diameter steerer tube. Key benefits — why you need it Reliable, lowfriction steering: doublesealed stainless steel bearings ( and bottom) provide longlasting, smooth rotation and reduce play for precise handling. Durable, lightweight build: forged, CNCmachined aluminum alloy shell with an anodized finish gives a strong, light assembly (120 g) that resists corrosion and keeps its appearance over time. Easy to fit and aligned: accurately sized 3434mm to match standard head tube dimensions, minimizing installation issues and ensuring correct alignment for dependable performance. What makes it stand out Dual sealed stainless steel bearings for quieter, more responsive steering under load and in rough terrain. Precisionmachined aluminum shell for tight tolerances and consistent headset fit. Available anodized finishes (black, blue, silver) that resist wear and corrosion. Performance and suitability Smooth, responsive handling with minimal friction even under demanding riding conditions. Lightweight construction keeps frontend weight down without sacrificing strength. Corrosionresistant finish suited for yearround riding and varied environments. Compatibility and specifications (do not omit) Head tube inner diameter: 34.0 mm Fork steerer outer diameter: 28.6 mm (standard 11/8' steerer) Size: 3434 mm Shell material: forged, CNCmachined aluminum alloy Bearings: dual sealed stainless steel bearings ( and bottom) Finish options: black, blue, silver anodized Weight: approximately 120 g Typical use scenarios 1. Trail or crosscountry mountain biking — a worn headset to restore crisp steering and reduce play on rough singletrack. 2. Road or commuter bike upgrade — lower steering friction and improve longevity while keeping weight minimal for daily use. 3. Maintenance or rebuild — straightforward swap for frames and forks that meet the listed 34.0 mm / 28.6 mm dimensions during a routine headset/service overhaul. Installation notes Designed for standard 11/8' threadless systems; ensure your frame and fork match the listed diameters (34.0 mm head tube ID and 28.6 mm steerer OD) before . Proper pressfit and alignment are important for bearing life and steering performance; use appropriate headset press tools or have a qualified mechanic install if unsure. This headset provides a durable, lightweight, and precise steering interface for compatible 11/8' threadless mountain and road bike frames, delivering quieter rotation and longlasting performance on varied terrain.