GZYF 12.6" Universal Motorcycle Rear Air Shock Absorbers 320mm Nitrogen-Charged Adjustable Preload

GZYF 12.6" Universal Motorcycle Rear Air Shock Absorbers are adjustable, nitrogen-charged rear shocks designed to fit many 150cc–750cc street bikes, scooters, mopeds and ATVs for improved comfort and control.

If you're replacing worn suspension or upgrading your bike's ride quality, these 12.6-inch rear air shocks offer a blend of adjustability, durable construction and a CNC-machined reservoir for better heat dissipation. Built from steel and aluminum alloy with a nitrogen-charged design and preload adjustment, they are intended as a universal option for a wide range of two- and four-wheeled vehicles—provided the eye-to-eye mounting distance matches your machine. Below you’ll find clear answers to common buyer questions so you can decide whether these shocks suit your project or replacement needs.

How do these shocks improve ride comfort and handling?

The GZYF rear air shocks use a nitrogen-charged damping system and a large-capacity reservoir to reduce harshness from bumps and manage heat during extended use. That combination helps filter small surface imperfections while still absorbing larger impacts for a smoother, more controlled ride.

• Nitrogen charge stabilizes damping and reduces aeration under load
• Large CNC-machined reservoir improves heat dissipation for consistent performance
• Steel and aluminum alloy construction resists wear for longer service life

Will these shocks fit my motorcycle or ATV?

Fitment depends primarily on the eye-to-eye distance; these are 12.6 inches (approximately 320 mm) between mounting eyes and intended for many 150cc–750cc bikes, scooters, mopeds and quads. Always measure the existing shock's eye-to-eye center-to-center length and compare the mounting hardware dimensions before ordering.

• Eye-to-eye length: 12.6 inches (320 mm) — confirm with your current shock
• Compatible with a broad range of street bikes, dirt bikes, scooters and ATVs
• May require adapter bushings or bolts depending on your frame and swingarm

What adjustment options are available and how do they affect performance?

These shocks provide adjustable spring preload that can be changed with basic tools, letting you tune sag and initial compliance for rider weight and load. Adjusting preload alters how much the suspension compresses under static load and influences acceleration and braking behavior.

• Tool-adjustable spring preload for custom sag and ride height
• Preload changes the firmness on acceleration and initial compression feel
• Fine-tuning helps balance comfort and stability for single or two-up riding

How durable are the materials and finish?

The GZYF shocks combine solid steel components with aluminum alloy elements to balance strength and weight. The reservoir is CNC-machined for precision and has inherent heat-dissipating properties, while the overall build is aimed at longevity under typical road and off-road conditions.

• Steel body sections provide structural strength and impact resistance
• Aluminum alloy reservoir reduces weight and improves thermal performance
• CNC machining ensures accurate fit and a clean visual finish

Who this is for: Riders who need a robust, adjustable replacement or upgrade for rear suspension on mid-displacement motorcycles, scooters, mopeds or ATVs and who can confirm the 12.6" eye-to-eye measurement. These shocks are suited to do-it-yourself mechanics, custom builders and anyone seeking improved ride control without a bike-specific OEM unit. Measure your current shocks, consider any needed mounting hardware, and use the preload adjustability to match rider weight and cargo requirements.