Motorcycle Rear Nitrogen Air Shock Absorbers 12.5in 320mm - Smooth

In this review the Newsmarts 12.5in (320mm) rear nitrogen air shock absorbers are evaluated for riders who want a noticeable improvement in comfort and control without a full suspension overhaul. These shocks are aimed at owners of Honda, Suzuki, Yamaha, Kawasaki and similar bikes and small UTV/ATV/Go Kart machines where the eye distance and spring thickness match the application. The biggest reason to consider them is the combination of a CNC aluminum reservoir and nitrogen damping that filters minor bumps and soaks bigger hits for a calmer, more stable ride.

Key Features

• Compatibility check: The shock's eye distance is the primary fit point so measuring your original shocks first helps ensure correct fitment.
• Nitrogen damping: The rear nitrogen chamber helps the shocks absorb significant impacts and reduces rebound for a smoother, more controlled ride.
• CNC reservoir tank: The aluminum large capacity reservoir is CNC machined for better heat dissipation and consistent performance under load.
• Durable construction: Steel and aluminum alloy components provide longevity and maintain shock absorption performance over time.
• Adjustable preload: The spring preload can be adjusted with a tool so riders can tune compression feel to match load and riding style.

Who It's For

This set is best for riders of small to mid-sized motorcycles, go karts, ATVs and UTVs who want an economical suspension upgrade that improves ride quality and stability. Mechanics and hobbyists who can confirm the eye-to-eye measurement and spring thickness will find these shocks straightforward to install.

Riders who need vehicle-specific, guaranteed OEM fitment or those who require highly tunable professional race suspension may want to look elsewhere; the shocks are a strong upgrade but depend on matching dimensions and spring rate to the bike for best results.

Pros & Cons

Pros

• Well built with steel and aluminum alloy for durability and reliable shock absorption.
• CNC aluminum reservoir improves heat dissipation and contributes to steady performance on longer rides.
• Adjustable spring preload allows riders to tailor compression and rebound to load and preference.
• Customers report improved ride quality, attractive appearance, and straightforward installation.

Cons

• Fit can be inconsistent if eye distance or spring thickness are not matched; measure carefully before purchase.
• Some riders find the springs softer or firmer than expected depending on vehicle and load, requiring further tuning.

Specifications

Brand	Newsmarts
Length (eye to eye)	12.5in (320mm)
Design	Rear nitrogen air shock with external reservoir
Reservoir material	CNC machined aluminum
Body material	Steel and aluminum alloy
Adjustability	Tool-adjustable spring preload
Intended vehicles	Motorcycle, UTV, ATV, Go Kart, Quad, Dirt bikes

Our Verdict

The Newsmarts 12.5in rear nitrogen air shocks are a sensible value upgrade for riders who confirm fitment by eye distance and spring thickness. They deliver improved ride quality, solid construction and useful preload adjustment, making them a good choice for street and light off-road use where enhanced comfort and stability are the goal.

Frequently Asked Questions

How do I confirm these shocks will fit my bike?
Measure the eye-to-eye distance of your current shocks and compare spring thickness; the eye distance is the compatibility confirmation point.

Can I adjust ride firmness?
Yes, the spring preload is adjustable with a tool so you can tune compression feel to suit load and riding style.

Are these suitable for heavy off-road use?
They improve impact absorption and heat dissipation, but for intense or competitive off-road racing riders may prefer purpose-built race shocks with broader tuning options.