GAsupply 4156 ATV Wheel Spacers 1 in 25mm 4 Lug - Improved Clearance

In this review the GAsupply 4156 ATV wheel spacers are assessed for riders who need a simple, durable way to increase tire clearance and change track width on compatible quads. The single biggest reason to buy is straightforward: these spacers are CNC machined from 6061-T6 aluminum and come pre-installed with high strength 12.9 grade bolts, delivering a lightweight yet robust spacer that fits the specified 4/156 bolt pattern and a 131mm center bore. For riders on Polaris and Kawasaki models listed in the fitment, they provide a reliable way to run wider or larger tires without complex modifications.

Key Features

• CNC machined construction: The 6061-T6 aluminum build keeps weight low while providing durable support for heavier tires and wider track setups.
• Pre-installed high grade bolts: The included 12.9 grade bolts reduce installation steps and improve long term clamping strength for safer wheel mounting.
• Anodized finish: The black anodized surface adds corrosion resistance so the spacers resist rust and fading in wet or muddy conditions.
• Precise fitment: Designed for a 4156 to 4156 bolt pattern and 131mm center bore, these spacers fit specific Kawasaki and Polaris model years without hub grinding.
• 25mm thickness: The 1 in spacer thickness gives noticeable additional clearance for wider tires or chains while maintaining handling balance.

Who It's For

These spacers suit ATV owners who ride Polaris Rangers, RZR, Sportsman series or the listed Kawasaki quads and who want a bolt-on way to increase tire clearance or achieve a wider stance. Installers who prefer parts that come ready with hardware will appreciate the pre-installed 12.9 bolts and the straightforward 4 lug design.

Riders who should look elsewhere include owners of wheels with a different stud thread (for example 12x1.5) or center bores larger than 131mm, since the product only fits wheels with 3/8-24 studs and the specified bore limit. Also, if a vehicle requires a different bolt pattern than 4156mm, these spacers will not work.

Pros & Cons

Pros

• Solid build from 6061-T6 aluminum for good strength-to-weight performance.
• Pre-installed 12.9 bolts simplify installation and improve durability.
• Black anodized finish resists corrosion and keeps appearance consistent.
• Compatible with many Polaris and Kawasaki model years, offering broad fitment where specified.

Cons

• Only compatible with wheels using 3/8-24 studs and a center bore up to 131mm, so fitment is limited.
• Available only in a single thickness (25mm) which may not suit every desired clearance or stance preference.

Specifications

Our Verdict

The GAsupply 4156 25mm wheel spacers are a practical, well-made option for owners of compatible Polaris and Kawasaki ATVs who want extra tire clearance or a wider stance without heavy modification. The durable CNC aluminum construction, pre-installed 12.9 bolts, and corrosion resistant anodized finish make them good value for the intended fitment, but buyers must confirm stud thread and center bore before purchasing to ensure a correct match.

Frequently Asked Questions

Will these fit my Polaris Ranger?
If your Ranger is among the listed model years and your wheel studs are 3/8-24 with a center bore no larger than 131mm, these spacers will fit.

Are bolts included and ready to install?
Yes, the spacers come with pre-installed 12.9 grade bolts, reducing the number of parts you need to handle during installation.

Can I use these on wheels with 12x1.5 studs?
No, these spacers are only for wheels that use 3/8-24 studs and will not fit 12x1.5 stud wheels.