Centramatic 300-318A Tandem Axle Trailer Balancer Set (4) | 16-17" Wheel | 8-Lug 9/16"

Centramatic 2-Axle Trailer Wheel Balancers (Pack of 4) – P/N 300-318A

Fits: 16"–17" Wheels | 8-Hole Pattern | 6.5" BC | 9/16" or 14mm Studs

Eliminate the "trailer hop" and vibration that lead to premature tire failure and structural wear. The Centramatic 300-318A is precision-designed for heavy-duty trailers with 9/16" or 14mm studs, providing a permanent solution that stabilizes all four wheels in real-time as you tow.

Technical Specifications

• Model #: 300-318A

• Vehicle Type: Tandem Axle Trailers (Toy Haulers, Horse Trailers, Flatbeds)

• Axle Compatibility: 2-Axle Single Wheel Setups

• Wheel Size: 16 in. to 17 in.

• Bolt Pattern: 8-Hole

• Bolt Circle: 6.5 in.

• Stud Size: Specifically for 9/16" or 14mm studs

• Quantity: Pack of 4 (Full set for two axles)

• ⚠️ Fitment Note: Due to variances between trailer models and hub designs, we may not be able to fit all applications. Please verify clearance before installation.

The "On-Board" Advantage for Towing

Centramatic's patented technology features a permanently sealed ring filled with hardened durametal alloy and proprietary synthetic fluid. As the wheel spins, centrifugal force automatically shifts this media to the exact opposite of heavy spots.

• Protect Your Cargo: Dramatically reduces the high-frequency vibration that can stress livestock or damage appliances and cabinetry in travel trailers.

• Maximum Tire Life: Proven to increase tire longevity by 25%–50% by preventing the cupping and irregular wear common on trailer tires.

• Lower Operating Temps: Keeps tires 8%–10% cooler, which is critical for preventing blowouts during long-distance hauls in high heat.

• Self-Adjusting: Automatically compensates for "flat spots" caused by long-term storage or mud and debris stuck in the rims.

Installation & Build Quality

• Maintenance-Free: A sealed, self-contained system with zero upkeep required—no beads to clog valves and no weights to fall off.

• Simple Setup: No pre-balancing required. These mount directly behind the wheel on the hub using your existing 9/16" or 14mm studs.

• Speed Activated: The balancing media shifts into the correct position at ~20–22 mph, providing stability at highway speeds.

• Made in the USA: Built in Texas and backed by a 5-Year / Unlimited Mileage Warranty.