The Origin8 Spire II is a solid alloy seatpost designed for riders who want durability, controlled saddle adjustment, and a small amount of setback without adding complexity. The one-piece forged design focuses on strength and consistency for everyday riding.
This post works well on mountain, hybrid, and commuting bikes where reliability and secure saddle support matter more than weight savings.
Key Features
• 3D forged one-piece AL6061-T6 construction
• Wide saddle clamp to reduce rail stress and flex
• Two-bolt micro-adjust clamp for precise angle control
• 15mm setback for subtle fit adjustment
• ISO-Mountain safety certified
Compatibility & Use Notes
• Seatpost diameter: 30.9mm
• Length: 350mm
• Setback: 15mm
• Compatible with standard two-rail saddles
• Not compatible with frames requiring a different seatpost diameter
• Not intended for dropper-post use
Service / Ownership Context
The wide clamp design spreads load across the saddle rails, which helps with durability on rougher rides. Tighten both clamp bolts evenly and to spec. Use appropriate assembly compound based on frame material and recheck torque after initial rides.
Fit & Use Signals
• Your frame requires a 30.9mm seatpost
• You want a strong, no-nonsense alloy post
• You need a small amount of setback for fit
• Not a fit if your frame uses a different diameter
• Not a fit if you want a dropper or zero-setback post
