GZYF 12.6" Universal Motorcycle Rear Air Shock Absorbers - Adjustable Nitrogen-Charged, Heavy-Duty Replacement

GZYF 12.6" Universal Rear Air Shock Absorbers are adjustable, heavy-duty replacements designed to improve ride comfort and stability for 150cc–750cc street bikes, scooters, mopeds and ATVs.

If your bike feels harsh over bumps, or you’re modifying a ride and need a reliable, tunable rear suspension component, these GZYF air shocks provide a combination of a nitrogen-charged reservoir, adjustable spring preload and rugged construction. They’re engineered to filter small road imperfections and absorb larger impacts, while offering tool-adjustable preload so you can tailor the compression and rebound feel to the load and riding style.

Will these shocks fit my motorcycle or ATV?

Fit depends primarily on the eye-to-eye (mount-to-mount) distance; the 12.6" specification refers to that key measurement. Many 150cc–750cc street bikes, scooters, mopeds and some quads use shocks in this range, but always measure your existing unit before purchasing.

• Eye-to-eye distance: 12.6" (confirm your current shock measurement).
• Compatible with a wide range of street bikes and small to midsize ATVs.
• Suitable for replacement or style-upgrade projects when dimensions match.

How do the air reservoir and nitrogen charge improve performance?

The large CNC-machined aluminum reservoir increases fluid and gas volume, reducing heat buildup during extended use and improving consistent damping. The nitrogen charge helps maintain pressure under load, giving steadier response over repeated compressions compared with simple oil-only designs.

• CNC aluminum reservoir for better heat dissipation and durability.
• Nitrogen-charged damping reduces foaming and maintains consistent performance.
• Improved resistance to fade on longer or rougher rides.

What adjustment options are available and how do they affect the ride?

These shocks feature an adjustable spring preload that you change with common tools to match rider weight, passenger or luggage. Increasing preload firms the initial spring rate for heavier loads or aggressive acceleration; decreasing preload softens the feel for lighter riders and a more compliant ride.

• Tool-adjustable spring preload for quick tuning without disassembling the unit.
• Preload changes alter sag and initial compression feel to suit load and style.
• Use preload adjustments to balance rear-end height and maintain steering geometry.

Are these shocks built to last and handle varied riding conditions?

GZYF combines steel and aluminum-alloy components to deliver a durable assembly that resists wear from road use and environmental exposure. The combination of sturdy materials, a sealed reservoir and machining quality aims to extend service life while preserving damping performance.

• Solid steel body sections for load-bearing strength.
• Aluminum alloy reservoir and CNC machining for corrosion resistance and heat management.
• Sealed design to protect internal components from dirt and moisture.

Who is this for: Riders upgrading worn or stock rear suspension on 150cc–750cc motorcycles, scooters, mopeds and small ATVs who want a balance of comfort and tunability. It’s ideal for people performing maintenance or customizing the look of their machine and for weekend riders who encounter mixed surfaces and need a dependable, adjustable shock. Make sure the 12.6" eye-to-eye measurement matches your bike before ordering to ensure correct fitment.