The Unifiber HD SDM Aluminium Mast Extension (U-Pin) is a heavy-duty extension designed to deliver maximum strength, stiffness, and long-term reliability.

Built with a reinforced aluminium tube and a solid HD plastic base, it provides a durable and rigid structure that performs even in extreme conditions. The additional reinforcement between the base and the tube increases overall stiffness, improving power transfer and ensuring peace of mind under high loads.

The 3-pulley system offers an 8:1 mechanical advantage, making it easier to apply high downhaul tension while reducing effort during rigging. Low-friction pulleys enhance efficiency and setup precision.

Its compact and solid design makes it comfortable for barefoot rigging, while the universal U-Pin system ensures compatibility with most baseplates on the market.

An excellent choice for riders looking for a tough, dependable extension for freeride, freerace, and harsh conditions.

Key features

• Heavy-duty construction for intensive use
• Reinforced aluminium tube for strength and durability
• Solid HD plastic base
• Stiff and direct connection for better control
• 3-pulley system with 8:1 downhaul ratio
• Low-friction pulleys for easier rigging
• Compact, barefoot-friendly design
• Compatible with U-Pin systems

Technical specifications

• Mast compatibility: SDM
• Locking system: U-Pin push button
• Extension range: approx. 4 – 30 cm
• Downhaul ratio: 8:1
• Number of pulleys: 3
• Materials:
  • Tube: reinforced aluminium
  • Base: high-strength HD plastic
• Usage: heavy duty / demanding conditions
• Available sizes: 16 / 30 / 46 cm