3434mm Mountain Bike Headset — Aluminum alloy cups with sealed double bearings, CNC machined and anodized for reliable steering performance. Why you need this headset Smooth, consistent steering: Dual sealed bearings reduce friction and preserve precise rotation for better control on technical trails. Longlasting durability: CNC machined aluminum alloy construction and anodizing resist wear and maintain tight tolerances under repeated use. Direct fit for common frames: Engineered to 34mm upper and lower cup outer diameters for secure, rattle integration with compatible head tubes. Key features and benefits Exact 3434mm fit: Upper and lower cup OD precisely 34mm to match frames requiring 34mm cups; internal geometry supports stable handling and responsive control on uneven terrain. Straight fork compatibility: Designed for standard straight steerer forks with an upper steerer OD of 28.6mm and lower of 30mm, allowing seamless installation and dependable alignment. Sealed double bearings: Dual sealed bearings keep dirt and moisture out, lower maintenance needs, and provide consistent rotation over time. CNC machined + anodized finish: Precision machining ensures accurate fitment; anodizing improves surface hardness and corrosion resistance for demanding trail conditions. Improved ride confidence: Reduced play and smoother steering translate to more predictable handling on climbs, descents, and rough sections. Practical applications / use scenarios Replacement upgrade: Swap a worn or loose headset on a hardtail or fullsuspension mountain bike that uses 34mm cups and a straight 28.6mm steerer to restore crisp steering and reduce play. Performance tuning for trail riding: Install this headset when building or upgrading a trail bike to improve steering responsiveness during technical climbs and fast, rough descents. Workshop build: Use in frame builds or custom bike assemblies that call for a 3434mm headset and compatibility with 28.6mm straight steerer forks for a precise, lowmaintenance steering assembly. Compatibility checklist Frame cup outer diameter: 34mm upper and lower Fork steerer: Straight steerer, upper 28.6mm (lower 30mm) Bike type: Mountain bikes requiring reliable steering performance What it delivers Reliable, smooth steering with reduced maintenance Precise fit and alignment from CNC machining and anodizing Durable performance in trail and offroad conditions If your bike frame and fork match the above dimensions, this 3434mm sealed doublebearing aluminum headset is a practical, durable choice to restore or improve steering performance without complex ongoing maintenance.