Air Shocks

Air Shock Buying Guide

Air shocks use a pressurised air chamber as the spring, making them significantly lighter than coil alternatives and adjustable without swapping hardware. They’re the default choice on most full-suspension mountain bikes from trail to enduro.

How Air Shocks Work

Air pressure in the main chamber supports the rider’s weight (replacing a metal spring). A negative air chamber helps the shock break away smoothly at the top of the stroke. The damper cartridge controls compression and rebound speed, just like in a coil shock.

Volume Spacers and Progressivity

Adding volume spacers (small plastic tokens) reduces the air volume in the positive chamber, making the spring curve more progressive. This means the shock ramps up resistance as it compresses further, helping prevent bottoming out on big hits without making the initial stroke feel harsh. Most riders benefit from 1–3 spacers depending on riding style and frame design.

Popular Air Shocks

• Fox Float X2: The flagship. Four-way adjustable damper with excellent support and sensitivity. Standard on high-end enduro bikes.
• Fox Float DPX2: Trail-focused, lighter and simpler than the X2. Three-position lever plus rebound adjust.
• RockShox Super Deluxe Air: Charger damper platform with DebonAir+ air spring. Strong performer, easy to service.
• Cane Creek DB Air: Twin-tube design with the most adjustment range of any production shock.
• RockShox SIDluxe: XC-specific. Lightweight with a firm lockout for climbs.

Buying Used Air Shocks

• Check for air leaks: Inflate to your riding pressure and leave overnight. A slow leak means the air can seals need replacing — a cheap service but factor it into the price.
• Shaft condition: The shaft must be smooth and free of scratches. Any damage here causes seal wear and leaks.
• Damper test: Compress the shock slowly. It should feel smooth and controlled. If it collapses with no resistance, the damper needs a rebuild.
• Service intervals: Air shocks should be serviced every 50–100 hours (air can) and annually (full damper). Ask the seller when it was last done.